Radiologic Imaging Studies Research Articles

Failure Modes in Orthopedic Oncologic Reconstructive Surgery: A Review of Imaging Findings and Failure Rates.

Limb salvage surgeries utilizing endoprostheses and allografts are performed for a variety of oncologic conditions. These reconstructions can fail and require revision for many reasons, which are outlined and classified into mechanical failures (soft tissue failures, aseptic loosening, structural failure), non-mechanical failures (infection, tumor progression), and pediatric failures (physeal arrest, growth dysplasia). Distinct radiologic and clinical findings define specific failure subtypes but are sparsely illustrated in the radiology literature. Specifically, an understanding of the organizational structure of the failure modes can direct radiologists' search for post-reconstruction complications, enhance an appreciation of their prognostic significance, and facilitate research by standardizing the language and conceptual framework around outcomes. The purpose of this review is to highlight the key radiologic findings and imaging studies of each failure mode in orthopedic oncologic reconstructive surgery in the context of risk factors, failure rates, prognosis and survival statistics, and clinical decision-making regarding chemotherapy, radiation, and revision surgery.

E-scooter-related imaging: a new emerging high-energy trauma patient.

To quantify the volume and nature of radiological imaging performed for e-scooter related trauma presentations in a tertiary referral centre and to identify common radiological pattern of injuries. Our study received institutional review board approval. We retrospectively reviewed all anonymised radiological imaging studies performed in our institution for the term 'scooter' or 'e-scooter' between July 2020 and July 2021. The patient demographics, number of imaging studies performed and modality type as well as the nature of injuries identified were recorded. Within the study period, 147 patients with e-scooter-related injuries were referred for radiological imaging. Forty-two (29%) of those patients had positive radiological findings. The vast majority of injuries on radiographs were upper limb injuries typical of a fall on outstretched hand (FOOSH) pattern. Thirty-two patients (22%) required advanced diagnostics with CT or MRI with 11 of these patients having positive findings. Four patients suffered significant head injuries including skull fractures and/or intracranial haemorrhage. Five patients suffered facial bone fractures, and 2 suffered spinal fractures. One patient suffered a handlebar abdominal trauma with a resulting large bowel injury ultimately requiring bowel resection. E-scooter-related injuries represent a new and emerging high-energy trauma patient. These patients demonstrate injury patterns similar to other high-energy trauma such as road traffic accidents. Although the most common injuries are musculoskeletal upper limb injuries typical of FOOSH, a large proportion of these require advanced diagnostic imaging (CT, MRI) which were commonly positive for significant injuries.

The COVID-19 Pandemic's Effect on Preventive Imaging

This study assessed the effect of the COVID-19 pandemic on preventive care imaging and potential disparities because preventive care may be perceived as nonurgent. The objective was to identify the associations between the COVID-19 pandemic and changes in preventive imaging volumes for patients in general and as affected by race and ethnicities. The authors performed a retrospective observational study by extracting the weekly volumes of all imaging studies between January 7, 2019 and May 1, 2022 from a radiology data warehouse at a tertiary care medical center (n=92,105 preventive imaging studies and 3,493,063 total radiology imaging studies) and compared preshutdown with postshutdown periods using a 2-sample t-test. Additional comparisons stratified by race and ethnicity were performed for mammograms and bone density examinations using interrupted time series models with negative binomial error distribution to assess the immediate level change and trends over time of preventive imaging volumes after shutdown. The authors found a significant decrease in bilateral mammograms, bone density examinations, and aortic ultrasound examinations in the postshutdown period compared with those in the preshutdown period (p<0.001, p=0.003, and p=0.001, respectively). There were no significant changes in low-dose computed tomography chest examinations (p=0.46). The shutdown was associated with a significant immediate decrease in mammograms in the Hispanic and Latino group to approximately three quarters of its preshutdown level (p=0.04). For bone density examinations, postshutdown weekly volumes tripled compared with the preshutdown volumes for Hispanic or Latino patients and doubled for non-Hispanic Black patients (p<0.0001 for both). In comparison, a significant decrease was seen for Other patients (reduced to nearly a fifth of preshutdown volume) (p<0.0001). There was a significant decrease in overall volume of bilateral mammograms, bone density examinations, and aortic ultrasound examinations after pandemic shutdown. For mammograms, some of this decreasing trend was already seen before shutdown (such as for patients with Other race), so the shutdown was only specifically associated with an immediate decrease in mammogram levels in the Hispanic and Latino group. For bone density examinations, the shutdown was unexpectedly associated with an increase in volumes for Hispanic or Latino patients and non-Hispanic Black patients, which was countered by a significant steep decrease in volumes only for patients of Other race. Health systems should carefully explore their preventive screening examination volumes to determine which patients should be actively engaged to assure catch up on recommended care.

Effect of emergent nephrostomy on long-term total and split renal function in patients with upper urinary tract obstruction due to pelvic malignant tumors

PurposeThis study aimed to investigate the impact of nephrostomies on the outcome of total renal function (TRF) and split renal function (SRF) in patients with malignant pelvic tumors associated with upper urinary tract obstruction (UUTO).MethodsPatients with pelvic tumors suffering severe unilateral hydronephrosis treated at our hospital from 2000 to 2022 were included. Data for nephrostomy placement, short- and long-term renal function, and radiological and nuclear imaging studies were collected. The TRF and SRF of patients who underwent nephrostomy were compared to those who did not.ResultsSeven patients were included (rhabdomyosarcoma: 5, ovarian germ cell tumor: 1, malignant rhabdoid tumor: 1). Nephrostomies were placed in four, which were successfully managed without severe infections. Estimated glomerular filtration rate (eGFR) was significantly improved at the end of treatment in patients with nephrostomy. In contrast, eGFR in patients who did not undergo nephrostomy was not improved. Nuclear imaging studies (renograms or renal scintigrams) revealed impaired SRF of the affected kidney compared to the contralateral kidney, even in patients whose eGFR was within normal levels. Notably, SRF showed a trend to improve over time in one patient treated with nephrostomy.ConclusionNephrostomy for UUTO caused by pelvic tumors may improve renal outcome.

Unnecessary Explantation of IDEAL IMPLANT Structured Saline Breast Implants Prompted byRadiologic Misdiagnosis of Rupture.

The unique dual-lumen and baffle design of the IDEAL IMPLANT Structured Saline breast implant gives it specific advantages over both silicone gel-filled and the original saline-filled implants. This internal baffle structure also gives it an appearance on various radiologic imaging studies that may be misinterpreted as a rupture because of similarities to the well-known radiologic appearance of a ruptured silicone gel implant. Patients may present with various misinterpreted imaging studies, highlighting the need for plastic surgeons and radiologists to be familiar with the normal appearance of the intact IDEAL IMPLANT and be able to distinguish it from a ruptured IDEAL IMPLANT. The radiology findings must be correlated with the clinical findings, or an intact IDEAL IMPLANT misdiagnosed as ruptured, may cause unnecessary patient worry, and may prompt unnecessary surgery for removal or replacement.

Should Breastfeeding Be Interrupted after Radiological Imaging Examinations? Evidence and Clinical Applications.

Purpose: Breastfeeding provides optimal growth and development for infants. Lactating mothers may have challenges maintaining breastfeeding, and one of those challenges is being falsely advised to interrupt breastfeeding following radiologic studies. The aim of this study was to evaluate the knowledge, attitudes and experiences of healthcare professionals regarding breastfeeding after radiological imaging studies on lactating mothers. Method: In this cross-sectional study, an online survey consisting of 29 semi-structured questions was delivered to radiology technicians and physicians in radiology and pediatrics via social media. Mixed methods were used to analyze responses descriptively. Results: Of the 404 participants, 39% (n = 158) were radiology technicians, 31% (n = 125) were pediatricians, 11% (n = 46) were radiologists, 10% (n = 41) were pediatric residents and 8% (n = 34) were radiology residents. Of all healthcare professionals, 91% reported that breastfeeding does not need to be interrupted after ultrasound, 75% X-ray, 56% mammography, 62% non-contrast CT, 18% contrast-enhanced CT, 93% non-contrast MRI and 23% contrast-enhanced MRI. Interruption of breastfeeding was recommended more frequently after contrast-enhanced imaging studies (p < 0.01). After contrast-enhanced CT, 54% of participants recommended pumping and dumping for <24 h and 25% for 24-48 h; after contrast-enhanced MRI, these rates were found to be 57% and 20%, respectively. Of the healthcare professionals, 63% reported that their knowledge about management of breastfeeding after radiological studies was not sufficient. Conclusions: Situations requiring the interruption of breastfeeding after radiological studies are rare. However, recommendations in clinical practice vary in our country. Increasing the awareness and knowledge of healthcare professionals will prevent breastfeeding from being negatively affected.

Osteonecrosis of the Knee: The Unintended Consequence of Steroid Abuse.

The anti-inflammatory and immunosuppressive properties of steroids allow their use in a wide variety of rheumatological diseases, asthma, inflammatory bowel disease, cancer therapy, and severe viral infections. Though life-saving or organ-saving, long-term clinical use leads to a vast array of complications. Osteoporosis is the most common orthopedic side effect of steroid abuse, while osteonecrosis is a rare occurrence. The risk of osteonecrosis appears to be dose and duration dependent, but several patient factors also play a major role and usually affect the femoral head followed by the knee joint. The long-term effects of steroids must be explained to all patients on therapy, but this risk is missed in individuals who abuse steroids for recreational or performance-enhancing purposes. We describe a male, aged 29 years, who presented with dull aching bilateral knee pain of 2-years' duration after a long-term steroid abuse for weight and muscle mass gain. Radiological and magnetic resonance imaging studies confirmed osteonecrosis of femoral and tibial condyles and secondary degenerative arthritis of the knee joint. Prompt suspicion, early diagnosis, and intervention in osteonecrosis of knee joints, and termination of steroids may reverse the pathology and prevent progression of disease.

NnUNet for Automatic Kidney and Cyst Segmentation in Autosomal Dominant Polycystic Kidney Disease.

Autosomal Dominant Polycystic Kidney Disease (ADPKD) is a genetic disorder that causes uncontrolled kidney cyst growth, leading to kidney volume enlargement and renal function loss over time. Total kidney volume (TKV) and cyst burdens have been used as prognostic imaging biomarkers for ADPKD. This study aimed to evaluate nnUNet for automatic kidney and cyst segmentation in T2-weighted (T2W) MRI images of ADPKD patients. 756 kidney images were retrieved from 95 patients in the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease (CRISP) cohort (95 patients × 2 kidneys × 4 follow-up scans). The nnUNet model was trained, validated, and tested on 604, 76, and 76 images, respectively. In contrast, all images of each patient were exclusively assigned to either the training, validation, or test sets to minimize evaluation bias. The kidney and cyst regions defined using a semi-automatic method were employed as ground truth. The model performance was assessed using the Dice Similarity Coefficient (DSC), the intersection over union (IoU) score, and the Hausdorff distance (HD). The test DSC values were 0.96±0.01 (mean±SD) and 0.90±0.05 for kidney and cysts, respectively. Similarly, the IoU scores were 0.91± 0.09 and 0.81±0.06, and the HD values were 12.49±8.71 mm and 12.04±10.41 mm, respectively, for kidney and cyst segmentation. The nnUNet model is a reliable tool to automatically determine kidney and cyst volumes in T2W MRI images for ADPKD prognosis and therapy monitoring.

Magnetic resonance imaging preprocessing and radiomic features for classification of autosomal dominant polycystic kidney disease genotype.

Our study aims to investigate the impact of preprocessing on magnetic resonance imaging (MRI) radiomic features extracted from the noncystic kidney parenchyma of patients with autosomal dominant polycystic kidney disease (ADPKD) in the task of classifying PKD1 versus PKD2 genotypes, which differ with regard to cyst burden and disease outcome. The effect of preprocessing on radiomic features was investigated using a single T2-weighted fat saturated (T2W-FS) MRI scan from PKD1 and PKD2 subjects (29 kidneys in total) from the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease study. Radiomic feature reproducibility using the intraclass correlation coefficient (ICC) was computed across MRI normalizations (-score, reference-tissue, and original image), gray-level discretization, and upsampling and downsampling pixel schemes. A second dataset for genotype classification from 136 subjects T2W-FS MRI images previously enrolled in the HALT Progression of Polycystic Kidney Disease study was matched for age, gender, and Mayo imaging classification class. Genotype classification was performed using a logistic regression classifier and radiomic features extracted from (1)the noncystic kidney parenchyma and (2)the entire kidney. The area under the receiver operating characteristic curve (AUC) was used to evaluate the classification performance across preprocessing methods. Radiomic features extracted from the noncystic kidney parenchyma were sensitive to preprocessing parameters, with varying reproducibility depending on the parameter. The percentage of features with good-to-excellent ICC scores ranged from 14% to 58%. AUC values ranged between 0.47 to 0.68 and 0.56 to 0.73 for the noncystic kidney parenchyma and entire kidney, respectively. Reproducibility of radiomic features extracted from the noncystic kidney parenchyma was dependent on the preprocessing parameters used, and the effect on genotype classification was sensitive to preprocessing parameters. The results suggest that texture features may be indicative of genotype expression in ADPKD.

Investigating the clinical outcomes of bulking agent injection in comparison with modified Gil-Vernet anti-vesicoureteral reflux surgery in children with high-grade reflux (4 or 5)

BackgroundVesicoureteral reflux (VUR) is a common condition associated with childhood urinary tract infection (UTI) that can lead to chronic renal failure and hypertension. Various anti-reflux treatments were advocated, with various degrees of morbidity and success. The purpose of this study is to analyze and compare the results of modified Gil-Vernet anti-reflux surgery and bulking agent injection in children with unilateral high-grade reflux.MethodsThe study involved 179 patients who underwent surgical interventions for primary VUR from February 2013 to September 2019. Data on baseline demographics, preoperative symptoms, radiological imaging studies, and postoperative outcomes were analyzed. Treatment goal was defined as when no VUR or downgrading was detected 6 months or later after the intervention.ResultsA total of 128 patients underwent modified Gil-Vernet anti-reflux surgery and 51 patients underwent dextranomer/hyaluronic acid (Dx/HA) injection with mean VUR grading of 4.3 in both groups (P = 0.687). The overall VUR resolution rates were significantly higher in modified anti-reflux surgery rather than Dx/HA injection (86% vs. 68%, P = 0.021). Dx/HA injection was associated with shorter operation time (21 ± 8 min vs. 57 ± 11 min, P = 0.01), and shorter hospital stay (0.34 ± 0.22 days vs. 3.50 ± 0.50 days, P < 0.001). No major complications were identified in both groups.ConclusionsDx/HA injection has a significantly shorter operation time, lower postoperative analgesic usage, and shorter hospital stay, modified Gil-Vernet anti-reflux surgery is associated with significantly higher VUR downgrading and resolution rates than Dx/HA injection, particularly in the higher grade VUR.

Deep learning-based automated kidney and cyst segmentation of autosomal dominant polycystic kidney disease using single vs. multi-institutional data

PurposeThis study aimed to investigate if a deep learning model trained with a single institution's data has comparable accuracy to that trained with multi-institutional data for segmenting kidney and cyst regions in magnetic resonance (MR) images of patients affected by autosomal dominant polycystic kidney disease (ADPKD). MethodsWe used TensorFlow with a Keras custom UNet on 2D slices of 756 MRI images of kidneys with ADPKD obtained from four institutions in the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease (CRISP) study. The ground truth was determined via a manual plus global thresholding method. Five models were trained with 80 % of all institutional data (n = 604) and each institutional data (n = 232, 172, 148, or 52), respectively, and validated with 10 % and tested on an unseen 10 % of the data. The model's performance was evaluated using the Dice Similarity Coefficient (DSC). ResultsThe DSCs by the model trained with all institutional data ranged from 0.92 to 0.95 for kidney image segmentation, only 1–2 % higher than those by the models trained with single institutional data (0.90–0.93).In cyst segmentation, however, the DSCs by the model trained with all institutional data ranged from 0.83 to 0.89, which were 2–20 % higher than those by the models trained with single institutional data (0.66–0.86). ConclusionThe UNet performance, when trained with a single institutional dataset, exhibited similar accuracy to the model trained on a multi-institutional dataset. Segmentation accuracy increases with models trained on larger sample sizes, especially in more complex cyst segmentation.

Coexistence of Pseudotumor Cerebri and Chiari Malformation Type 1

Objective: To identify different radiological markers for the diagnosis of the coexistence of pseudotumor cerebri and Chiari malformation type 1. Method: Patients who were clinically suspected to have Chiari malformation type 1 and were referred to the Department of Radiology between 2007 and 2020, and whose diagnosis was radiologically confirmed through magnetic resonance imaging (MRI), were retrospectively evaluated. A total of 49 Chiari malformation type 1 patients with both cervical and cerebral examinations and 49 control subjects of the same age and gender without a diagnosis of Chiari malformation type 1 were included in the study. In Chiari malformation type 1 diagnosed patients, the presence of pseudotumor cerebri, the presence of syringomyelia in cervical spinal MRI images, and the distance of cerebellar tonsils and obex according to McRae line were evaluated in millimeters. Result: In Chiari malformation type 1 clinically and radiologically diagnosed cases, the cerebellar tonsils and obex were located lower in patients with a radiological diagnosis of pseudotumor cerebri compared to those without, and the rate of accompanying syringomyelia appeared to be higher. However, no statistically significant difference was observed between the two groups. Conclusion: The coexistence of pseudotumor cerebri and Chiari malformation type 1 is more common than previously estimated. Different treatment protocols in the coexistence of pseudotumor cerebri and Chiari malformation type 1 emphasize the importance of making this diagnosis. Further radiological imaging studies are needed to identify different radiological markers for the diagnosis of the coexistence of pseudotumor cerebri and Chiari malformation type 1.

Role of ancillary investigations in medicolegal autopsy to establish the cause of death and legal implications

Sudden death in young females can have various causes and it is important to investigate the cause thoroughly. In cases with a vague history, postmortem ancillary investigation can also help to establish or rule out potential causes of death, such as underlying medical conditions or environmental factors. These investigations may include various laboratory tests, such as toxicology, histology, microbiology, and genetic analysis, as well as radiological imaging studies. This information not only helps in ascertaining the cause and manner of death but also helps in establishing the legal connotations in any medicolegal case. This is a case of a young woman allegedly 18 years brought for a medicolegal autopsy. She had been feeling unwell for a few days before her death, experiencing vomiting, weakness, and fatigue. Although no underlying disease was diagnosed, she was advised to take a pregnancy test. Fifteen days later, she died at home continuing to feel unwell. Upon autopsy, the young woman was found to be emaciated, and revealed a male fetus, of 4 to 5 months of gestational age, in her uterus. A radiological examination of bones conducted postmortem revealed that the age of woman was approximately 15 years old. Postmortem microbiology analysis revealed the presence of the bacteria Leuconostoc mesenteroides in a blood sample collected from the subclavian vein. The pathogenicity of this bacteria in the cause of death along with the role of ancillary investigation in the light of Indian criminal law and its challenges are being discussed.

Clinical Outcomes of Internal Iliac Artery Interruption during Endovascular Aneurysm Repair.

This study aimed to investigate the clinical outcomes of internal iliac artery (IIA) interruption during endovascular aneurysm repair (EVAR) and to identify the risk factors for ischemic complications. Endovascular treatment was performed in 316 patients with aneurysms or pseudoaneurysms of the abdominal aorta or iliac arteries between March 2006 and January 2022. Medical records and radiological imaging studies were retrospectively reviewed. The incidences of buttock claudication, ischemic colitis, and spinal cord ischemia after IIA interruption were investigated as clinical outcomes. Binary logistic regression analysis were performed to identify the risk factors. IIA embolization was performed in 78 patients. Among the 42 patients who underwent IIA flow preservation procedures, the one-month computed tomography detected early failure in five patients. The origin of the IIA was covered with an endograft in ten patients who did not undergo embolization. Eventually, interruption of the IIA by EVAR was observed in 93 patients. Considering preoperative IIA occlusion, there was a total of six patients who did not have at least one IIA patency. Buttock claudication occurred in 32.6% of the patients, and none of the patients had ischemic colitis or spinal cord ischemia. In multivariable analysis, age ≤80 years and isolated iliac artery aneurysm were associated with the development of postoperative buttock claudication. The most common complication after IIA interruption is buttock claudication; however, critical complications such as ischemic colitis or spinal cord ischemia are rare, even in bilateral IIA occlusion. Adjunctive procedures to preserve bilateral IIA perfusion should be adopted selectively.

Can Anterior Osteophyte Fractures Be Distinguished From Fracture Mimics in the Subaxial Cervical Spine? A Retrospective Analysis Evaluating Reported Fractures With Clinical Management Correlation.

This study aimed to retrospectively distinguish true- from false-positive fractures of anterior subaxial cervical osteophytes, which were reported on noncontrast computed tomography reports, and to correlate the imaging findings with patient symptoms and analyze the downstream impact on management of both true and false positive fractures. A total of 127 patients had computed tomography reports of anterior osteophyte fractures. Radiology reports and imaging studies were evaluated to distinguish true fractures from fracture mimics. We analyzed imaging features including rigid spine (RS), prevertebral soft tissue swelling (PVSTS), and instability. We categorized symptoms and examination findings into 3 groups (0, asymptomatic; 1, neck pain; 2, neurological symptoms). Management was categorized into 3 groups (0, no treatment; 1, external bracing; 2, surgery). Associations between imaging features, fracture classification, clinical symptoms, magnetic resonance imaging utilization, and management were calculated using χ2 with Cramer V test to determine effect size. Eighty patients had false-positive fractures, and 47 were true positive. There were significant associations between magnetic resonance imaging utilization and fracture classification (P ≤ 0.001), PVSTS (P ≤ 0.005), patient symptoms (P ≤ 0.001), and patient management (P ≤ 0.001). There were significant associations between patient management and fracture classification (P ≤ 0.001), patient symptoms (P ≤ 0.001), PVSTS (P ≤ 0.001), imaging findings of instability (P ≤ 0.001), and RS (P ≤ 0.021). There were significant associations between fracture classification and patient symptoms (P ≤ 0.045), and RS (P ≤ 0.006). Subaxial isolated anterior osteophyte fractures fell into 3 major categories. By our methodology, if a suspected fracture was determined to be a fracture mimic in an asymptomatic patient, it was unlikely to be clinically significant. Isolated anterior osteophyte fractures without neurological symptoms or more concerning imaging findings can be treated conservatively. Finally, fractures that demonstrate indirect signs of instability or are associated with RS are more associated with surgical management.

Hurthle cell carcinoma: a rare variant of thyroid malignancy - a case report.

The authors present a case of a 49-year-old female with a known case of chronic obstructive pulmonary disease and hypertension who presented to our hospital with anterior neck swelling for 4 months that has gradually increased over the time. Physical examination, laboratory test, various radiological imaging, and cytological study led to the diagnosis of Hurthle cell neoplasm. With prompt diagnosis, she was admitted and surgery was done that include right hemithyroidectomy. Though it is a rare type of thyroid malignancy, early diagnosis and proper treatment has shown a very good prognosis. Hurthle cell carcinoma initially presents with a single, painless palpable mass in the thyroid with pressure symptoms in advanced cases including dysphagia, dyspnea, and hoarseness. Pain, rapid growth, or significant compressive symptoms are suggestive of an invasive one. This case highlights on rarity of disease, presentation, and availability of treatment modality.

Ability of ChatGPT to generate competent radiology reports for distal radius fracture by use of RSNA template items and integrated AO classifier

The amount of acquired radiology imaging studies grows worldwide at a rapid pace. Novel information technology tools for radiologists promise an increase of reporting quality and as well quantity at the same time. Automated text report drafting is one branch of this development. We defined for the present study in total 9 cases of distal radius fracture. Command files structured according to a template of the Radiological Society of North America (RSNA) and to Arbeitsgemeinschaft Osteosynthese (AO) classifiers were given as input to the natural language processing tool ChatGPT. ChatGPT was tasked with drafting an appropriate radiology report. A parameter study (n=5 iterations) was performed. An overall high appraisal of ChatGPT radiology report quality was obtained in a score card based assessment. ChatGPT demonstrates the capability to adjust output files in response to minor changes in input command files. Existing shortcomings were found in technical terminology and medical interpretation of findings. Text drafting tools might well support work of radiologists in the future. They would allow a radiologist to focus time on the observation of image details and patient pathology. ChatGPT can be considered a substantial step forward towards that aim.

Risk Severity Model for Pediatric Autosomal Dominant Polycystic Kidney Disease Using 3D Ultrasound Volumetry.

Height-adjusted total kidney volume (htTKV) measured by imaging defined as Mayo Imaging Class (MIC) is a validated prognostic measure for autosomal dominant polycystic kidney disease (ADPKD) in adults to predict and stratify disease progression. However, no stratification tool is currently available in pediatric ADPKD. Because magnetic resonance imaging and computed tomography in children are difficult, we propose a novel 3D ultrasound-based pediatric Leuven Imaging Classification to complement the MIC. A prospective study cohort of 74 patients with genotyped ADPKD (37 female) was followed longitudinally with ultrasound, including 3D ultrasound, and they underwent in total 247 3D ultrasound assessments, with patients' median age (interquartile range [IQR]) at diagnosis of 3 (IQR, 0-9) years and at first 3D ultrasound evaluation of 10 (IQR, 5-14) years. First, data matching was done to the published MIC classification, followed by subsequent optimization of parameters and model type. PKD1 was confirmed in 70 patients (95%), PKD2 in three (4%), and glucosidase IIα unit only once (1%). Over these 247 evaluations, the median height was 143 (IQR, 122-166) cm and total kidney volume was 236 (IQR, 144-344) ml, leading to an htTKV of 161 (IQR, 117-208) ml/m. Applying the adult Mayo classification in children younger than 15 years strongly underestimated ADPKD severity, even with correction for height. We therefore optimized the model with our pediatric data and eventually validated it with data of young patients from Mayo Clinic and the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease used to establish the MIC. We proposed a five-level Leuven Imaging Classification ADPKD pediatric model as a novel classification tool on the basis of patients' age and 3D ultrasound-htTKV for reliable discrimination of childhood ADPKD severity.

Utility of new image-derived biomarkers for autosomal dominant polycystic kidney disease prognosis using automated instance cyst segmentation

New image-derived biomarkers for patients affected by autosomal dominant polycystic kidney disease are needed to improve current clinical management. The measurement of total kidney volume (TKV) provides critical information for clinicians to drive care decisions. However, patients with similar TKV may present with very different phenotypes, often requiring subjective decisions based on other factors (e.g., appearance of healthy kidney parenchyma, a few cysts contributing significantly to overall TKV, etc.). In this study, we describe a new technique to individually segment cysts and quantify biometric parameters including cyst volume, cyst number, parenchyma volume, and cyst parenchyma surface area. Using data from the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease (CRISP) study the utility of these new parameters was explored, both quantitatively as well as visually. Total cyst number and cyst parenchyma surface area showed superior prediction of the slope of estimated glomerular filtration rate decline, kidney failure and chronic kidney disease stages 3A, 3B, and 4, compared to TKV. In addition, presentations such as a few large cysts contributing significantly to overall kidney volume were shown to be much better stratified in terms of outcome predictions. Thus, these new image biomarkers, which can be obtained automatically, will have great utility in future studies and clinical care for patients affected by autosomal dominant polycystic kidney disease.

A Descriptive Study on the Clinical Profile and Outcomes of Patients with COVID-19 and Tuberculosis Co-infection.

Tuberculosis (TB) control has been a challenge in the country and its overall health impact remains significant. COVID-19 has caused significant morbidity and mortality especially among hospitalized patients. TB and COVID-19 co-infection (COVID-TB) may cause more catastrophic consequences and outcomes among afflicted individuals and management may be daunting. There is limited local data on COVID-TB. The clinical profile of COVID-TB patients who were admitted were described. Comparison of the clinical outcomes was also done versus the general admitted COVID-19 patients without concomitant TB in the same institution. Relevant patient outcomes were reported which included admission to an intensive care unit (ICU), length of hospital stay, and mortality rate. This is a descriptive study on the demographics and clinical outcomes of patients admitted in the Philippine General Hospital (PGH) for COVID-19 with TB co-infection from March 2020 to September 2020. We aimed to characterize patients with COVID-TB and analyzed their outcomes. There was a total of 79 patients who were admitted for COVID-19 (confirmed with RT-PCR) with TB co-infection during the study period. Majority of them were males (70.9%) with a median age of 54 (IQR 42 to 64) years. In terms of TB affliction, 75 (94.9%) patients were identified to have pulmonary tuberculosis. Majority of patients had at least one co-morbid illness with hypertension (16.5%), diabetes mellitus (13.9%), and heart failure (11.4%) as the most common. Respiratory symptoms (dyspnea and cough) were the predominant presenting complaint during hospital admission. Majority of the patients were classified as severe (8 or 10.1%) and critical (36 or 45.57%) COVID-19 disease. Fifty-six (70.9%) were bacteriologically confirmed tuberculosis. Radiologic imaging studies revealed findings consistent with pulmonary tuberculosis in 70 (88.61%) through plain radiograph. Forty-seven underwent HRCT and 46 of these (97.8%) had findings suggestive of PTB. Overall, 61 patients (77%) subsequently required oxygen supplementation. The in-hospital mortality within the study population was 36.7% (29/79) in contrast to the general COVID patients admitted in the same period which revealed significantly less fatality at 17.5% (35/200). The length of hospital stay was found to be 21.1 days ± 14.75 days across all study patients, and with median of 20 days for surviving patients. TB treatment outcomes were tracked in the 50 surviving COVID-19 patients where cure was declared in 8/50 (16%) while 22/50 (44%) successfully completed their six-month treatment regimen. This study of COVID-TB provides an initial evaluation of the potential association between active TB infection and COVID-19 severity and mortality. The data generated from this study may be a starting point to assess the interaction of these two diseases. Furthermore, bidirectional screening may be recommended even at hospitals' triage areas since both diseases may have similar presentations.