Prior Imaging Research Articles

FOLLICULIN GENE MUTATION IN A YOUNG WOMAN WITH RECURRENT PNEUMOTHORAX

TOPIC: Genetic and Developmental Disorders TYPE: Medical Student/Resident Case Reports INTRODUCTION: Folliculin (FLCN) gene mutation, commonly linked with Birt-Hogg-Dube (BHD) syndrome, is associated with primary spontaneous pneumothorax (PSP). PSP is defined by air in the pleural space in those without a history of lung disease or trauma. A pneumothorax (PTX) can be a life-threatening condition that requires immediate tube thoracostomy placement. Here, we present a case of recurrent PSP in a woman presenting with dyspnea. CASE PRESENTATION: A 36-year-old woman non-smoker with a history of unclassified bullous lung disease and recurrent PTX status post right video assisted thoracoscopic surgery (VATS) with mechanical pleurodesis and left VATS with talc pleurodesis presented to the emergency department (ED) with progressive dyspnea. Family history was notable for bullous lung disease and PTX in her maternal grandfather and mother. Days prior to ED, she developed right sided pleuritic chest pain after yoga that self-resolved. Chest radiography revealed right sided pleural effusion without signs of PTX. A day prior to the ED, she developed dyspnea with exertion. On admission, she was at 100% saturation on room air, normotensive and had decreased breath sounds in her right lower lung field. Computed tomography (CT) revealed a new large right basilar, anterior, medial PTX and redemonstration of multiple bilateral bullae unchanged from prior imaging. VATS was recommended but refused. A 10.3 French chest tube was placed to wall suction overnight. Repeat CT revealed near complete resolution of the PTX with unchanged bullae. Genetics workup revealed an FLCN mutation c.1584del; p.Glu530Argfs*7 suggesting the cause of recurrent PTX. DISCUSSION: A diagnosis of PSP requires the exclusion of lung diseases such as cystic fibrosis and alpha-1-antitrypsin, connective tissue disorders such sjogren's and marfan syndromes, rare conditions such as lymphangioleiomyomatosis and tuberous sclerosis. PSP commonly occurs due to rupture of subpleural bullae and can be a complication of BHD syndrome. BHD syndrome is a hereditary cancer disorder characterized by renal cell cancer, colonic polyps, hair follicle hamartomas, lung cysts and PTX. It is associated with a FLCN gene mutation, which is expressed in type I pneumocytes that form the structure of alveoli. FLCN mutation lung cysts are hypothesized to be due to a defect in cell-cell adhesion resulting in expansion of alveolar spaces. FLCN mutation patients can rarely present with a purely spontaneous PTX. PSP treatment options include a chest tube (recurrence rate (RR) 26.4%), VATS pleurectomy (RR 0.4%), VATS abrasion (RR 2.3%) and lung transplantation. CONCLUSIONS: A FLCN gene mutation should be excluded in those with recurrent PTX. Genetic testing should be considered as well as appropriate cancer screening with renal ultrasound and colonoscopy given its association with BHD. REFERENCE #1: Boone, P. M. et al. (2019). The genetics of pneumothorax. AJRCCM, 199(11), 1344-1357. REFERENCE #2: Daccord, C. et al. (2020). Birt–Hogg–Dubé syndrome. European Respiratory Review, 29(157), 200042. REFERENCE #3: Frohlich, B. et al. (2008). Novel mutations in the folliculin gene associated with spontaneous pneumothorax. European Respiratory Journal, 32(5), 1316-1320. DISCLOSURES: No relevant relationships by George Moran, source=Web Response No relevant relationships by Hekmat Nasiri, source=Web Response No relevant relationships by Sudhir Rajan, source=Web Response

REACTIVATION OF PULMONARY COCCIDIOIDES IN THE SETTING OF COVID-19 INFECTION

TOPIC: Chest Infections TYPE: Medical Student/Resident Case Reports INTRODUCTION: Clinical course and management of severe acute respiratory syndrome COVID-2 (Covid-19) infection has been full of uncertainties. As a viral respiratory illness, its presentation can be very similar to other respiratory diseases. Therefore, it is essential to have a high degree of suspicion for superimposed bacterial and fungal infections. CASE PRESENTATION: A 65-year-old male with insulin-dependent diabetes mellitus presented to the emergency department with fever, sudden shortness of breath, cough, and diffuse chest discomfort. Upon arrival his blood pressure was 155/76 mmhg, heart rate 91 bpm, respiratory rate of 22, with temperature of 101.9 F. The patient's Covid-19 PCR nasopharyngeal swab resulted positive. Imaging showed moderate to severe bilateral lung ground-glass infiltrates and consolidation pattern and a 1.9 cm, left upper lobe cavitary lesion. No prior imaging was available for review. Patient was treated with supplemental oxygen, antibiotic therapy for community acquired pneumonia, Remdicivir, and convalescent plasma therapy. Given low suspicion for active TB, steroid therapy was continued. Patient's QuantiFERON gold resulted positive, and he was found to have positive coccidioides IgG, but the complement fixation titer was negative on the day of admission. Three AFB samples, serum (1-3)-beta-D-Glucan assay and Aspergillus assay resulted negative. Bronchoalveolar lavage was performed. Serum coccidioides antibody complement fixation and immunodiffusion results were made available after the patient's passing, which showed positive for IgG and IgM with titers 1:256. Bronchoalveolar lavage cultures revealed Coccidioides Posadasii and Immitis. DISCUSSION: Coccidioidomycosis, commonly known as valley fever, is caused by dimorphic fungi of the Coccidioides family, which is endemic to California, south-central Washington, and northern Mexico. Pulmonary Coccidioides has a similar clinical presentation to Covid-19 infection and seldom, associated with cavitary lesions. Fever, cough, and shortness of breath are the most common presenting symptoms. Radiographic findings vary with COVID -19 showing bilateral peripheral ground glass opacifications with or without consolidations. Among the bacterial co-infections, streptococcus pneumoniae is the most common followed by Klebsiella pneumoniae and Haemophilus influenzae. Due to lengthy wait periods for many laboratory studies to be resulted, it is challenging to distinguish co-infection cases. Reactivation of coccidiodes has been seen in patients with HIV, and patients on chemo and immunotherapy despite antifungal prophylaxes. CONCLUSIONS: Given nonspecific radiological findings of Covid-19 infection that are seen with other causes of pneumonia and its uncertain and similar clinical course to other respiratory infections, it is crucial to have a high degree of suspicion for superimposed bacterial and fungal infections. REFERENCE #1: Freedman M, Jackson BR, McCotter O, Benedict K. Coccidioidomycosis Outbreaks, United States and Worldwide, 1940-2015. Emerg Infect Dis. 2018;24(3):417-423. doi:10.3201/eid2403.170623 REFERENCE #2: Galgiani JN, Ampel NM, Blair JE, et al. 2016 Infectious Diseases Society of America (IDSA) Clinical Practice Guideline for the Treatment of Coccidioidomycosis. Clin Infect Dis. 2016;63(6):e112-e146. doi:10.1093/cid/ciw360 REFERENCE #3: Zhu X, Ge Y, Wu T, et al. Co-infection with respiratory pathogens among COVID-2019 cases. Virus Res. 2020;285:198005. doi:10.1016/j.virusres.2020.198005 DISCLOSURES: No relevant relationships by Nami Moradi, source=Web Response No relevant relationships by Paloma Rivero-Moragrega, source=Web Response

INFECTED SIMULTANEOUS MEDIASTINAL BRONCHOGENIC CYST AND ESOPHAGEAL DUPLICATION CYST MASQUERADING AS A LUNG ABSCESS

TOPIC: Genetic and Developmental Disorders TYPE: Fellow Case Reports INTRODUCTION: Bronchogenic and esophageal duplication cysts are rare but significant developmental anomalies. We present a case with both types of cyst in a single mass mimicking a lung abscess with a protracted treatment course. CASE PRESENTATION: A healthy 26-year-old female was admitted with onset of left sided pleuritic chest pain and fever over 24 hours. Her exam was remarkable for fever and tachycardia; she had elevated markers of infection. Computed tomography (CT) of chest revealed a well-demarcated cystic mass in the left hemithorax with an air-fluid level. She had no prior chest imaging and denied aspiration events or substance use. She was thought to have an intraparenchymal lung abscess, and underwent CT guided aspiration with the drainage of frank purulent material. Because of suspected intraparenchymal location no drain was placed. Fluid cultures and cytology were negative but her sputum grew mucoid pseudomonas aeruginosa, which was an atypical pathogen in this patient. She was treated with four weeks of intravenous cefepime, and two weeks of levofloxacin and metronidazole, with serial imaging. Pleuritic chest pain persisted despite regression of the lesion over a 10-month period (Figures 1-3); after which she underwent resection through a left video-assisted thoracic surgical approach. Intraoperatively, a large densely adherent inflammatory lesion was connected to the esophagus without intraluminal connection. Thick purulent fluid from the cyst was sent for culture and cytology, which were again negative. Pathology of the cystic mass was consistent with an esophageal duplication cyst (EC) (Figure 4B) with an additional noncommunicating bronchogenic cyst (BC) (Figure 4A). At 6months follow-up visit, she was doing well and free of symptoms. DISCUSSION: To our knowledge this is the first case report of de-novo infected dual BC/EC in an adult. Our case highlights the need for consideration of congenital cysts while working up lung abscesses. The diagnosis may be difficult without surgical resection, as characteristic imaging findings are missing in up to half of cases. 1There is likely a role for aspiration of the cyst for both diagnostic and therapeutic purposes, however efficacy and safety data are limited.2 The optimal timing of cyst resection is also not clear, especially in asymptomatic cysts. There is a minimal evidence to support universal surgical resection, though infected and symptomatic cysts will continue to need surgical intervention. 2,3 CONCLUSIONS: Infected congenital cysts can present a diagnostic and therapeutic challenge. Atypical presentations, and lack of improvement with appropriate therapy, are important clues to the diagnosis. REFERENCE #1: St-Georges R, Deslauriers J, Duranceau A, Vaillancourt R, Deschamps C, Beauchamp G, Pagé A, Brisson J. Clinical spectrum of bronchogenic cysts of the mediastinum and lung in the adult. Ann Thorac Surg 1991; 52:6–13. REFERENCE #2: Kirmani B, Kirmani B, Sogliani F. Should asymptomatic bronchogenic cysts in adults be treated conservatively or with surgery? Interact Cardiovasc Thorac Surg. 2010 Nov; 11(5): 649-59. REFERENCE #3: Fievet L, Gossot D, de Lesquen H, Calabre C, Merrot T, Thomas P, Becmeur F, Grigoroiu M. Resection of bronchogenic cysts in symptomatic versus asymptomatic patients: an outcome analysis, The Annals of Thoracic Surgery (2020) DISCLOSURES: no disclosure on file for Gary Hochhheiser; No relevant relationships by Obieze Nwanna Nzewunwa, source=Web Response No relevant relationships by Edmund Sears, source=Web Response No relevant relationships by Hilamber Subba, source=Web Response

S2613 Management and Outcomes of Complex Cystic Masses With Malignant Transformation

Introduction: Liver cysts are generally simple and benign; we describe the presentation and outcomes of 3 patients with rare complex cystic tumors that emphasize the broad differential diagnosis for this condition. Case Description/Methods: The records of 3 patients were reviewed with respect to presenting symptoms, their management and clinical outcomes. A 47 year old male with a history of pancreatic neuroendocrine tumor and liver metastases underwent a multivisceral transplant including the liver. Three years later he complained of postprandial right upper quadrant (RUQ) and chest pain. A new 13 cm cystic lesion was found in his liver. Surgical resection of the mass was performed revealing an angiosarcoma with epithelioid features. The patient’s condition rapidly deteriorated with weakness and muscle wasting. Given the aggressive nature of the tumor and patient debility, the patient was admitted to hospice. A 38 year old female presented with postprandial RUQ pain and CT showed a 2.5 cm complex cystic liver mass with growth compared to prior imaging. The mass was surgically removed. Pathology showed a mucinous cystic tumor with a few foci of high grade neoplasia. Follow-up imaging shows continued resolution of disease without need for adjuvant therapy. The third case, a 63 year old female, has a history of hypothyroidism and an asymptomatic 4 cm complex liver cyst for a decade until it rapidly started growing to 7.6 cm with RUQ pain. Laparoscopic marsupialization with fenestration revealed a biliary cystadenoma. Follow up imaging showed a 4 cm cystic area secondary to residual inflammation. Discussion: The majority of hepatic cysts are benign and less than 5 % are malignant. Imaging characteristics may provide insight into discerning benign epatic cysts from malignant ones. Complex cysts have many septations and contain hemorrhagic or proteinaceous fluid. Biliary cystadenoma, which is premalignant, and biliary cystadenocarcinoma usually present as complex cysts. Mucinous cystic neoplasms of the liver are very rare, usually complex, premalignant, yet definitive diagnosis is challenging. Primary hepatic angiosarcomas are seen in middle aged patients; these have a propensity for local recurrence and malignant change. These cases emphasize the importance of the follow up and an early intervention of incidentally found hepatic large complex cysts.

RAPID PROGRESSION OF ILD SECONDARY TO DOCETAXEL USE IN SOUTH ASIAN FEMALE

TOPIC: Pulmonary Manifestations of Systemic Disease TYPE: Medical Student/Resident Case Reports INTRODUCTION: Docetaxel is a taxane-based chemotherapy, which inhibits microtubule disassembly during the M phase of mitosis leading to apoptosis. Here we present a case of a South Asian female who presented with acute interstitial lung disease (ILD) after completing six cycles of this drug. CASE PRESENTATION: A 58-year-old immigrant from South Asia with a past medical history of hypertension and diabetes mellitus presented with fatigue. CT abdomen/pelvis identified a left ovarian mass with metastatic omental involvement. Subsequently a total abdominal hysterectomy was done and she was initiated on chemotherapy with carboplatin and docetaxel. After completing three cycles, she developed dyspnea and a dry cough that was treated with antibiotics and discontinuation of lisinopril. The patient's pre-treatment chest CT did have changes consistent with mild interstitial lung disease. Repeat chest CT after three cycles demonstrated some progression of ILD with minimal fibrotic changes and a decision was made to complete the remaining cycles of chemotherapy. The patient's respiratory symptoms progressively worsened over the two months after chemotherapy completion. She began to have low grade fevers with minimal response to antibiotics. However, her functional and respiratory status continued to decline, becoming increasingly oxygen dependent. She was eventually admitted to the hospital where repeat chest CT identified acute on chronic interstitial lung disease with diffuse fibrotic changes; new compared to prior imaging. She had multiple hospitalizations over the next two months for respiratory failure requiring BIPAP and steroids. Despite therapy, she had rapid progression of her pulmonary disease, was placed on comfort measures and passed away. DISCUSSION: This case highlights the importance of recognition of docetaxel as a cause for acute on chronic interstitial lung disease in an Asian female. Taxanes cause proliferation of cytotoxic T cells, leading to direct lung damage through reactive oxygen metabolites. There is a paucity in literature regarding the mechanism of docetaxel leading to rapid progression of ILD as an adverse effect in the South Asian population with pre-existing ILD, or whether dose dependent therapy plays a role in this population. This patient developed dyspnea and cough after 3 cycles of chemotherapy and discontinuation of docetaxel may have prevented her poor outcome. CONCLUSIONS: Docetaxel induced ILD is a serious adverse effect and early recognition of symptoms will lead to early diagnosis, prevention of this complication, and consideration for alternative chemotherapy options. REFERENCE #1: Antony R, Krishna S, James J, et al. Case report on docetaxel-induced interstitial lung disease. Asian Journal of Pharmaceutical and Clinical Research. 2017;10:10-12. Published 2017 Oct. doi:10.22159/ajpcr.2017.v10i10.19043. REFERENCE #2: Wang CJ, Chang HT, Chang CY. Docetaxel-related interstitial pneumonitis. Ther Clin Risk Manag. 2015;11:1813-1816. Published 2015 Dec 9. doi:10.2147/TCRM.S90488 DISCLOSURES: No relevant relationships by Prateek Juneja, source=Web Response No relevant relationships by Himabindu Lanka, source=Web Response No relevant relationships by Ananya Nanduri, source=Web Response No relevant relationships by Matk Sunga, source=Web Response No relevant relationships by Rocco Terrigno, source=Web Response

Small ruptured cerebral aneurysms-do they rupture on formation or not?

Of patients presenting with subarachnoid haemorrhage, most are due to rupture of a small aneurysm. It has been postulated that in most cases, these aneurysms form and rupture rapidly over a short period of time of days to weeks. We evaluated the hypothesis that such aneurysms therefore should never be discoverable as a pre-existing condition on medical imaging studies. All patients presenting with subarachnoid haemorrhage due to a small cerebral aneurysm over an 11-year period were reviewed for prior imaging studies capable of detecting small aneurysms. In the subgroup that had such imaging studies, these were reviewed for the presence or absence of the index aneurysm. Of 851 patients presenting with subarachnoid haemorrhage over an 11-year period, 35 had prior imaging studies capable of detecting small aneurysms. In 18 out of these 35 (51%) patients, the index aneurysm was identified as a small unruptured aneurysm on these prior studies. The median time between prior imaging and aneurysm rupture was 31months. The theory that nearly all cases of subarachnoid haemorrhage due to small aneurysms occur as a result of aneurysm formation, and rupture over a short time period is incorrect. Our findings indicate that at least half of all subarachnoid haemorrhage cases arise from the population harbouring small aneurysms as a pre-existing condition.

Pilomatrixoma and its Imitators.

Introduction: Pilomatrixomas are benign neoplasms derived from hair follicle matrix cells. They are among the most common soft tissue head and neck tumors of childhood. Pilomatrixomas are typically isolated, slow-growing, firm, nontender masses that are adherent to the epidermis but mobile in the subcutaneous plane. This clinical presentation is so characteristic that many experienced surgeons will excise suspected pilomatrixomas without prior imaging. We reviewed the results of this approach to determine whether physical examination alone differentiates pilomatrixomas from other similar soft tissue lesions of the pediatric head and neck. Methods: Computerized review of all pilomatrixomas over a 20-year period in a single academic pediatric otolaryngology practice. Results: 18 patients presented to our pediatric otolaryngology practice between 2001 and 2021 with historical and physical findings consistent with pilomatrixoma. Of the 18 patients, 7 were male and 11 were female. Ages ranged from 1.5 to 14years, with a mean of 7.5years. Most of the lesions (12) were located in the head and face, while the rest (6) were found in the neck. All patients were treated with complete surgical excision. Pathology confirmed pilomatrixoma in 15 patients. The remaining 3 children were found to have an epidermal inclusion cyst, a ruptured trichilemmal cyst, and a giant molluscum contagiosum lesion, respectively. One additional patient presented with a small lesion of the auricular helix that was thought to be a dermoid cyst, but proved to be a pilomatrixoma on histologic examination. Discussion: As pilomatrixomas are common and have a very characteristic presentation, surgical excision without prior diagnostic imaging will lead to correct treatment in the majority of cases. High resolution ultrasonography can help to confirm the diagnosis preoperatively, but is not definitive in large case series. Most of the cystic lesions that imitate pilomatrixoma will ultimately require surgical excision.

The role of endoscopic ultrasound in evaluating patients with bile duct dilation of unclear etiology.

Bile duct dilation (BDD) of unclear etiology is a common indication for further imaging via endoscopic ultrasound (EUS). We aimed to assess the yield of EUS in determining BDD etiology in patients with prior non-diagnostic imaging studies. A retrospective chart review was performed at a single, tertiary-care university hospital for patients referred for EUS for BDD with or without pancreatic duct dilation (PDD). EUS-guided fine needle aspiration (FNA) was performed if a focal lesion was identified. Cases with an etiology of BDD diagnosed or strongly suggested by prior imaging were excluded. EUS findings believed to represent a structural cause for BDD included a wide range of pancreaticobiliary and luminal pathology as well as patients' clinical factors. In total, 307 patients were identified. Findings to explain BDD were found by EUS in 213 patients for a diagnostic yield of 69.4%. Patients with jaundice were significantly more likely to receive a diagnosis by EUS than those without (78.8% vs 55.3%, P < 0.01). Notably, 8.1% of patients with normal liver function test (LFT) had a EUS-diagnosed malignancy. Patients' age, narcotic use, concurrent PDD and prior cholecystectomy did not appear to influence the EUS yield. EUS continues to play a substantial role in evaluating BDD of unclear etiology, most notably in patients with jaundice. In addition, given that 8.1% of asymptomatic patients without jaundice or abnormal LFT had malignancy diagnosed on EUS, the use of EUS for BDD of unclear etiology remains warranted.

The elusive diagnosis and emergent management of a late-presenting ruptured interstitial pregnancy: a case report

BackgroundInterstitial pregnancies are rare and often difficult to diagnose given their proximal position to the uterine cavity, however most are identified by 12 weeks gestation. Delayed or missed diagnosis contributes to heightened incidence of poor outcomes including hemorrhage and death.Case presentationA 35-year-old woman at 15 weeks gestation with confirmed intrauterine pregnancy on first trimester ultrasound and prior negative MRI presented in hemorrhagic shock and was found to have a ruptured interstitial pregnancy. Exploratory laparotomy revealed the fetus to be in the abdomen as well as a large cornual defect and abnormal placentation that resulted in supracervical hysterectomy.ConclusionsInterstitial pregnancy should be considered in a patient presenting with symptoms consistent with ectopic rupture, especially in the setting of equivocal or suboptimal prior imaging. Earlier diagnosis may allow for fertility-sparing intervention and decreased risk of morbidity and mortality.

Dynamic, Time-Resolved Computed Tomography Angiography Technique to Characterize Aortic Endoleak Type, Inflow and Provide Guidance for Targeted Treatment

Purpose: To illustrate dynamic, time-resolved CTA (d-CTA) imaging technique in characterizing aortic endoleak type/inflow using quantitative parameters and its value in providing image guidance for targeted treatment approach. Technique: Dedicated endoleak protocol involved acquiring multiple time-resolved contrast enhanced scans using third-generation CT scanner (Somatom Force®, Siemens Healthineers). Parameters such as scan field of view (FOV), kV, number/timing of scans were customized based on patient’s body-mass-index, timing bolus, and prior imaging findings. D-CTA image datasets were evaluated qualitatively and quantitatively using time-attenuation curves (TAC) analysis after motion correction using a dedicated software (syngo.via®, Siemens). D-CTA findings from 4 illustrative cases demonstrating type I, type II (inferior mesenteric and lumbar artery inflow), and type III endoleak were illustrated. TAC analysis with time to peak parameter enabled better characterization of endoleak type and inflow. During endoleak intervention, target vessels from d-CTA images were electronically annotated and overlaid on fluoroscopy using 2D−3D image fusion to provide image guidance for targeted treatment. Conclusion: D-CTA imaging with TAC analysis characterizes aortic endoleak type and inflow, in addition to providing image guidance for targeted endoleak treatment. Such dynamic, time-resolved imaging techniques may provide further insights into understanding aortic endoleak that remains an Achilles heel for endovascular aortic aneurysm repair.

Prospective intra-individual blinded comparison of [18F]PSMA-1007 and [68Ga]Ga-PSMA-11 PET/CT imaging in patients with confirmed prostate cancer.

[18F]PSMA-1007 has potential advantages over [68Ga]Ga-PSMA-11, although limited prospective data evaluating diagnostic performance exist. The aims of this study are to describe the concordance of [18FPSMA-1007 and [68Ga]Ga-PSMA-11 for TNM with the American Joint Committee on Cancer (AJCC) prognostic stage and assess differences in tracer uptake. Fifty men (mean age 71.8) were imaged with [68Ga]Ga-PSMA-11 and [18F]PSMA-1007 < 4weeks apart. Images were independently reported according to TNM by two experienced nuclear medicine specialists blinded to the other scan and prior imaging. Discordant results were resolved by a third independent nuclear medicine specialist. Quantitative analysis of lesion uptake and physiologic tissue for each tracer was performed by one experienced reader. Scan indications were initial staging (n = 12), biochemical recurrence (n = 27) and metastatic disease evaluation (n = 11). Most patients had ISUP grade group 3 or higher. Median PSA value was 2.7ng/ml (IQR 0.7-12.0), and a minority of patients (28%) were currently treated with androgen deprivation therapy. [18F]PSMA-1007 uptake was significantly higher than [68Ga]Ga-PSMA-11 in local recurrence, nodal and distant metastases and most physiologic sites (including bone) except for urinary bladder which was significantly lower. [18F]PSMA-1007 upstaged local prostate staging in 5/17 patients, local recurrence in 3/33 patients, regional nodal disease in 3/50 patients and 1 distant metastasis (bladder). [68Ga]Ga-PSMA-11 upstaged regional nodal disease in 1/50 patients and distant metastasis in one patient (right adrenal). Overall AJCC prognostic stage was concordant in 46/50 (92%) patients, with two patients upstaged for both [18F]PSMA-1007 and [68Ga]Ga-PSMA-11. [18F]PSMA-1007 had more equivocal results (one regional node; six equivocal bone lesions, one of which was subsequently confirmed metastatic) than [68Ga]Ga-PSMA-11 (one equivocal local recurrence). Overall AJCC prognostic stage was similar (92%) between [18F]PSMA-1007 and [68Ga]Ga-PSMA-11. [18F]PSMA-1007 demonstrates higher uptake within involved nodes and distant metastases and most physiologic sites except urinary bladder which aided [18F]PSMA-1007 local staging of the prostate primary/local recurrence and regional nodal disease adjacent ureters. However, [18F]PSMA-1007 liver uptake obscured a solitary right adrenal metastasis, and more equivocal bone lesions were identified. Trial registration The study was registered with Australia New Zealand Clinical Trials Registry (ACTRN12618000665235) on 24 April 2018.

Limited Chest Ultrasound to Replace CXR in Diagnosis of Pneumothorax Post Image-Guided Transthoracic Interventions.

To assess the diagnostic accuracy of limited chest ultrasound in detecting pneumothorax following percutaneous transthoracic needle interventions using chest X-ray (CXR) as the reference standard. With IRB approval, after providing consent, asymptomatic patients after percutaneous transthoracic needle interventions were enrolled to undergo limited chest ultrasound in addition to CXR. A chest Radiologist blinded to the patient's prior imaging performed a bedside ultrasound, scanning only the first 3 anterior intercostal spaces. Pneumothorax diagnosed on CXR was categorized as small or large and on ultrasound as grades 1, 2, or 3 when detected in 1, 2, or 3 intercostal spaces, respectively. 38 patients underwent 36 biopsies (34 lungs, 1 pleura, and 1 mediastinum) and 2 coil localizations. CXR showed pneumothorax in 13 patients. Ultrasound was positive in 10 patients, with 9 true-positives, 1 false-positive, 4 false-negatives, and 24 true-negatives. The false positive results were due to apical subpleural bullae. The false-negative results occurred in 2 small apical and 2 focal pneumothoraces at the needle entry sites. Four pneumothoraces were categorized as large on CXR, all of which were categorized as grade 3 on ultrasound. Sensitivity and specificity of US for detection of pneumothorax of any size were 69.23% (95%CI 38.6%, 90.1%) and 96.0% (95%CI 79.6%, 99.9%), and for detection of large pneumothorax were 100% (95%CI 39.8%, 100%) and 100% (95%CI 89.7%, 100%). Results of this prospective study is promising. Limited chest ultrasound could potentially replace CXR in the management of postpercutaneous transthoracic needle intervention patients.

White matter tract-specific alterations in patients with primary restless legs syndrome

Prior diffusion tensor imaging (DTI) studies have investigated white matter (WM) changes in patients with primary restless legs syndrome (RLS), but the results were inconsistent. Here, we proposed using tract-specific statistical analysis (TSSA) to find alterations in specific WM tracts to clarify the pathophysiological mechanisms of RLS. We enrolled 30 patients with RLS and 31 age- and sex- matched controls who underwent brain magnetic resonance imaging, neuropsychological tests, and polysomnography. Fractional anisotropy (FA) maps obtained from whole-brain diffusion tensor imaging and TSSA were used to localize WM changes in patients with RLS. Subsequently, a comparison of FA values for each tract between patients and controls was performed. The associations between FA values and clinical, polysomnographic, and neuropsychological parameters in RLS patients were assessed. RLS patients demonstrated decreased FA values in the left corticospinal tract (CST) and cingulum, and in the right anterior thalamic radiation (ATR) and inferior fronto-occipital fasciculus (IFO). Patients’ attention/executive function and visual memory scores positively correlated with FA values in the right ATR, and anxiety levels negatively correlated with FA values in the right IFO. Additionally, the number of periodic leg movements and movement arousal index were negatively correlated with FA values in the left CST. The TSSA method identified previously unknown tract-specific alterations in patients with RLS and significant associations with distinct clinical manifestations of RLS.

B-PO04-079 HEAD-TO-HEAD COMPARISON OF ATRIAL CMR AND VOLTAGE MAPPING FOR PREDICTION CLINICAL OUTCOMES AFTER ATRIAL FIBRILLATION ABLATION

Atrial magnetic resonance imaging and endocardial voltage mapping are clinical tools for assessing atrial fibrosis. Both techniques have been reported to predict arrhythmia recurrence after catheter ablation of atrial fibrillation. However, it is not known how the predictive value of these techniques compare. To compare the predictive value of atrial MRI and atrial voltage mapping for predicting arrhythmia recurrence after catheter ablation of atrial fibrillation. Consecutive patients undergoing first-time atrial fibrillation ablation with prior atrial magnetic resonance imaging and high-density voltage mapping were included. Atrial magnetic resonance imaging and voltage maps were quantified using open source software (Cemrgapp, (www.cemrg.com) and OpenEP (www.openep.io), respectively). Clinical follow-up occurred over a median of 574 days using ECG and Holter monitoring. Paired magnetic resonance imaging and voltage mapping was performed in 122 patients. Linear regression demonstrated increasing low voltage area (<0.5mV) was associated with age, CHADS2VASc score and left atrial volume. However, cox proportional hazards assessment showed that atrial LGE (>3.3SD above the blood pool mean) was a significant predictor of arrhythmia recurrence (HR 1.04, i.e. risk of recurrence increased by 4% for each 1% increase in fibrosis, p = 0.01), where-as low voltage area was not (<0.5mV). Atrial LGE, but not low voltage area was significantly associated with recurrence of atrial fibrillation after ablation. However, low voltage area was closely related to common clinical comorbidities associated with atrial fibrillation.

Molecular Imaging with 18F-FDG PET/CT and 99mTc-MIBI SPECT/CT in Osteitis Fibrosa Cystica Generalisata.

Benign so-called “brown tumors” secondary to hyperparathyroidism are a rare diagnostic pitfall due to their impressively malignant-like character in various imaging modalities. We present the case of a 65-year-old male patient with multiple unclear osteolytic lesions on prior imaging suspicious for metastatic malignant disease. Eventually, findings of 18F-FDG PET/CT staging and 99mTc-MIBI scintigraphy resulted in revision of the initially suspected malignant diagnosis. This case illustrates how molecular imaging findings non-invasively corroborate the correct diagnosis of osteitis fibrosa cystica generalisata with the formation of multiple benign brown tumors.

Fertility preservation and PGT-M in women with familial adenomatous polyposis-associated desmoid tumours

Research questionIs ovarian stimulation and pregnancy in women with familial adenomatous polyposis (FAP)-associated desmoid tumours safe? DesignThe study included women with FAP-associated desmoid tumours who underwent fertility treatments at the authors’ tertiary medical centre between the years 2011 and 2021. Data were collected from the fertility unit's charts and from the oncological registries. The main outcome measures were the number of vitrified oocytes and embryos, and the number of live births in preimplantation genetic testing for monogenic/single gene defects (PGT-M) cycles. ResultsOverall, 17 women were identified suitable for this study. A total of 117 mature oocytes were vitrified for fertility preservation and 106 embryos were submitted to PGT-M. One patient returned to claim her cryopreserved oocytes, and five patients who underwent PGT-M embryo transfer reported three live births. A statistically significant decrease in selected fertility cycle parameters was observed in one woman who co-administered sorafenib (a multikinase inhibitor) during her first cycles of treatment, as the mean number of oocytes before and after was 2.7 (±1.3) versus 13.2 (±3.3) (P = 0.02), the mean number of metaphase II oocytes was 2.2 (±2.1) versus 7.7 (±2.6) (P = 0.007), and the mean number of two-pronuclei oocytes was 0.5 (±1.1) versus 3.5 (±1.7) (P = 0.09). Three patients had a median desmoid tumour growth on magnetic resonance imaging of 6.2 (2.9–7.2) cm when compared with prior ovarian stimulation imaging. ConclusionsOvarian stimulation for women with desmoid tumours was characterized in some patients with an acceleration in tumour growth, regardless of the use of aromatase inhibitors. The use of sorafenib should be carefully considered during the course of fertility treatment.

Superior outcomes with double-balloon enteroscopy for small bowel lesion marking followed by intracorporeal as opposed to extracorporeal resection and reconstruction.

Double-balloon enteroscopy (DBE) is used for the diagnosis and therapy of small bowel disease. Endoscopic sampling and marking small bowel lesions destined for surgery permit intracorporeal resection and reconstruction (IRR), thereby facilitating a complete minimally invasive technique. There are limited data that compare outcomes of IRR to conventional extracorporeal resection and reconstruction (ERR). The purpose of this study was to evaluate the surgical outcomes of patients undergoing pre-operative DBE for lesion marking followed by laparoscopic IRR compared to those undergoing ERR. A retrospective chart review was performed on patients who underwent DBE followed by small bowel resection from 2006 to 2017 at a single tertiary care medical center. IRR was defined as laparoscopic inspection to identify the lesion (previously marked by DBE or by laparoscopic-assisted DBE) followed by intra-abdominal bowel resection and anastomosis with specimen extraction via minimal extension of a laparoscopic port site. ERR was defined as extracorporeal resection and/or reconstruction performed via a conventional or mini-laparotomy abdominal incision. A total of 82 patients met inclusion criteria and were reviewed. Thirty-two patients (39%) had ERR and 50 patients (61%) had IRR. The most common indications for DBE were small bowel bleeding (76%) and small bowel mass or thickening on prior imaging studies (16%). Successful DBE was higher in the IRR group when compared to the ERR group, but not significantly different (90% vs 75%, p-value 0.07). Patients who underwent IRR had faster bowel function recovery (2 vs 4days, p < 0.01), shorter time to discharge (3 vs 7days, p < 0.01), and fewer post-operative complications (10 vs 18; p < 0.01), when compared to the ERR group. DBE successfully facilitated laparoscopic small bowel IRR and this approach was associated with faster return of bowel function, shorter recovery time, and decreased morbidity when compared to ERR.

F-mode ultraviolet photoacoustic remote sensing for label-free virtual H&E histopathology using a single excitation wavelength.

Photoacoustic remote sensing (PARS) is a novel all-optical imaging modality that allows for non-contact detection of initial photoacoustic pressures. Using 266-nm excitation pulses, ultraviolet PARS (UV-PARS) has previously demonstrated imaging contrast for cell nuclei in histological samples with <400nm resolution. In prior PARS-based imaging schemes, the signal amplitude at an interrogation point was determined by the maximum deflection from the DC scattering signal in response to a pulsed excitation. This method, however, does not take into consideration additional information encoded in the frequency domain of the recorded PARS signals. Here, we present a frequency domain technique called F-mode PARS that can be used to generate images with nuclear and cytoplasmic enhanced contrast, enabling label-free virtual hematoxylin-and-eosin-like microscopy, using only a single excitation wavelength. With F-mode processing, we have been able to demonstrate contrast-to-noise ratios of up to 38 dB between cell nuclei and surrounding cytoplasm, which represents up to a 25-dB improvement over previous implementations of UV-PARS systems.

Abstract LB010: SMMART Program: A multi-omics tumor board with a focus on breast cancer

Abstract Many of the current approaches to personalized medicine rely on sequencing DNA to identify actionable mutations. However, growing evidence suggests that a multi-omic approach to more broadly assess biology is needed to improve patient outcomes. We have implemented a workflow for tissue acquisition, multi-omic clinical testing, and correlated computational biology analysis, within the Serial Measurements of Molecular and Architectural Responses to Therapy (SMMART) Program (Mitri et al, J Transl Med 2018). We report biopsy metrics, CLIA analytics utilized, the operation of a multi-omics tumor board, and clinical outcomes in metastatic breast cancer patients. A detailed clinical history of each patient was obtained, including demographics, tumor type, treatment and response to prior therapies, imaging, and blood tumor biomarkers. A comprehensive set of clinical assays was performed on newly obtained tumor biopsies, including immunohistochemistry (ER, PR, HER2, AR, BCL-2, and PD-L1), a targeted next-generation sequencing panel covering 225 genes (GeneTrails® Comprehensive Solid Tumor Panel), whole exome sequencing (Tempus xE), whole transcriptomic sequencing (Illumina TruSeq RNA exome), and a multiplex protein analysis of 22 key cancer proteins and phosphoproteins on the Nanostring platform (NanoString Vantage 3D™ Solid Tumor Panel). The integrated clinical and analytical information was made available to the multidisciplinary SMMART Clinical Tumor Board that provided treatment recommendations; the final treatment plan was at the discretion of the treating physician. Between 1/1/2017-1/1/2020, 53 breast cancer patients were consented. Seven screen-failed due to a lack of sites amenable to biopsy and 8 were actively co-consented to other clinical trials. The remaining 38 patients are included in this preliminary report. A total of 63 biopsies were collected from lymph node, liver, bone, soft tissue, lung, skin, breast, and brain. Serial biopsies (≥2) were obtained for 15 patients. Analytics were generated in 93.7% of biopsies. Tumor boards were held for 15 patients (17 total sessions). The experience and information gathered thus far have yielded the following unique cases: (1) single patient analysis of omics, imaging, and response over 42 months, (2) identification of an ERBB3 mutation with downstream pathway activation that responded to HER2-targeted therapy, and (3) clinically significant variation in hormonal and HER2 receptor status over time. We will provide an analysis across the 38 patients of treatment outcomes, analytics information content, biological changes observed through serial biopsies, and tumor board interventions. We demonstrate the feasibility of implementing a deep, real-time analytics platform for metastatic breast cancer patients that can provide new insight into therapeutic opportunities. The observed clinical responses support further use and investigation of this approach. Citation Format: Ben L. Kong, Brett E. Johnson, Jamie M. Keck, Souraya Mitri, Patrick Leyshock, Jayne M. Stommel, Kiara Siex, Marlana Klinger, Christina L. Zheng, Rochelle Williams-Belizaire, Shannon McWeeney, Jeremy Goecks, Annette Kolodzie, Alexander R. Guimaraes, George V. Thomas, Christopher L. Corless, Zahi I. Mitri, Joe W. Gray, Gordon B. Mills, Raymond C. Bergan. SMMART Program: A multi-omics tumor board with a focus on breast cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr LB010.

Risk factors associated with concussions in a college student population

PurposeTo determine risk factors associated with concussion among the general collegiate population using a unique data linkage methodology. MethodsStudent health medical, counseling, and disability access service data were linked with university enrollment data to provide a comprehensive, deidentified dataset of students who sought care at the student health center for concussion from 2016–2020. Using chi-squared tests and logistic regression, characteristics of students with and without concussion were evaluated. ResultsDuring the study period, 506 concussions from 474 students were identified (cumulative incidence rate of 51.7 per 10,000 students). Significant predictors of concussion included: younger age (<21 years): odds ratio (OR) = 3.52 (95% confidence intervals [CI], 2.78, 4.50), Greek affiliation: OR = 1.89 (95% CI, 1.56, 2.30), and utilization of counseling and psychological services: OR = 1.92 (95% CI 1.59, 2.32). Of the students with concussion, 47% had at least one other concussion within the preceding year. History of prior hospitalization or medical imaging for head injury increased subsequent concussion risk by 4.5 fold. ConclusionsLinking unique datasets provides a richer understanding of the characteristics and risk factors associated with student concussions than analysis of a single data source. This comprehensive dataset will enable future targeted interventions to prevent and treat college student concussions.