Initial Imaging Modality In Patients Research Articles

Cardiac imaging in cardiovascular complications due to COVID-19

Cardiovascular complications are a common manifestation of acute phase and chronic phase of coronavirus disease 2019 (COVID-19) infection. Complications include cardiomyopathy, myocardial infarction, arrhythmias, heart failure, and deep venous thrombosis. Imaging is widely used in patients with suspected myocardial injury or myocarditis. Because of its availability and portability, transthoracic echocardiography (TTE) is used as the initial imaging modality in patients with suspected COVID-19 myocarditis. Echocardiographic studies performed on patients with suspected or confirmed COVID-19 should be as focused as necessary to obtain diagnostic views but should also be comprehensive enough to avoid the need to return for additional images. Following COVID-19 infection, a variety of persistent respiratory, neurological, cardiovascular, and other symptoms can persist for weeks, months, or even years. A cardiac examination and any resulting abnormalities in the structure and function of the heart may occasionally last for several months following a COVID-19 diagnosis. This is referred to as long COVID syndrome. Cardiac magnetic resonance (CMR) imaging has often been used clinically to complement echocardiography, particularly tissue characterization imaging which demonstrated subclinical myocardial edema with or without fibrosis in patients recovered from illness. Keyword: cardiac complication, cardiac imaging, cardiomyopathies, COVID-19

Diagnostic Approach of Mesenteric Cyst in Children: A Case Report

Background: Mesenteric cysts are intra-abdominal masses that arise from obstructed lymphatic drainage within the mesentery. Early diagnosis can be challenging, as it is often difficult to recognize based solely on clinical findings. The diagnosis is frequently made following imaging studies or during surgery. Despite their generally benign nature, delayed diagnosis can lead to serious complications. This case report aims to share our experience on the diagnostic approach for mesenteric cysts in children. Case: A 2-year-old boy presented with a 14-month history of slowly progressive abdominal distension and signs of bowel obstruction, including weight loss. Abdominal ultrasound revealed thin-walled, well-demarcated, septated fluid sacs consistent with a cyst. Abdominal CT-Scan showed massive ascites filling the intraperitoneal cavity and pushing the intestine upward along the thickened mesentery, causing bowel obstruction. Histopathological examination confirmed the diagnosis of cyst lymphangioma derived from mesentery. The cyst was successfully excised via laparotomy, and histological examination confirmed it as a cystic lymphangioma. Discussion: Our diagnostic approach focused on exclusion of differential diagnosis for abdominal distention in children, including ascites, abdominal tuberculosis, mesenteric cysts, and intra-abdominal masses. The absence of constitutional symptoms and lack of response to anti-tuberculosis therapy made it an unlikely diagnosis. While the CT-scan suggested ascites, the ultrasound results suggested a mesenteric cyst. Despite its large size, a complete excision of the cyst was successfully performed via laparotomy. Conclusion: The nonspecific nature of mesenteric cysts often delays diagnosis, making abdominal ultrasound an essential initial imaging modality for patients suspected of having this condition.

141 Frequency of Computed Tomography When Point-of-Care Ultrasound Is Performed for Acute Flank Pain in the Emergency Department

Renal point-of-care ultrasound (POCUS) has become increasingly utilized as an initial imaging modality for patients who present to the emergency department (ED) with suspected renal colic. Despite the widespread use of POCUS for this indication, the way in which ultrasound findings impact downstream ED testing, consultation, and admission or discharge remains unclear. The aim of this study is to describe the frequency of ordering abdominal computed tomography (CT) scans in a single, academic ED, when point-of-care ultrasound is performed for suspected renal colic.

Imaging of Fibrosis in Chronic Pancreatitis.

Chronic pancreatitis (CP) describes long-standing inflammation of the pancreas, which leads to irreversible and progressive inflammation of the pancreas with fibrosis. CP also leads to abdominal pain, malnutrition, and permanent impairment of exocrine/endocrine functions. However, it is difficult to assess CP pathologically, and imaging modalities therefore play an important role in the diagnosis and assessment of CP. There are four modalities typically used to assess CP. Pancreatic duct features are assessed with magnetic resonance cholangiopancreatography (MRCP) and endoscopic retrograde cholangiopancreatography (ERCP). However, ERCP is a rather invasive diagnostic modality for CP, and can result in adverse events such as post-ERCP pancreatitis. Computed tomography (CT) is often the most appropriate initial imaging modality for patients with suspected CP, and has high diagnostic specificity. However, CT findings typically only appear in advanced stages of CP, and it is difficult to detect early CP. Endoscopic ultrasonography (EUS) provides superior spatial resolution compared with other imaging modalities such as CT and magnetic resonance imaging (MRI), and is considered the most reliable and efficient diagnostic modality for pancreatic diseases. The EUS-based Rosemont classification plays an important role in diagnosing CP in clinical practice. Evaluation of tissue stiffness can be another option to assess the diagnosis and progression of CP, and MRI and EUS can be used to assess CP not only with imaging, but also with elasticity measurement. MR and EUS elastography are expected to provide new alternative diagnostic tools for assessment of fibrosis in CP, which is difficult to evaluate pathologically.

Knee alterations in rheumatoid arthritis: Comparison of US and MRI

ObjectiveThis study was designed to compare the diagnostic efficacy of ultrasonography (US) and magnetic resonance imaging (MRI) in detecting changes in the knee of patients with rheumatoid arthritis (RA) and discover the possible association between the serological index and bone erosion detected by US.Patients and methodsIn this retrospective study, the US images and MRI findings of the knee in patients with RA from December 2017 to January 2020 were evaluated. Diagnostic outcomes were compared. The rheumatoid factor, C-reactive protein, erythrocyte sedimentation rate, and anti-cyclic citrullinated peptide antibody (ACPA) levels of the patients were recorded. The relation between laboratory index and US findings was analyzed by multivariable logistic regression.ResultsUS showed remarkable accuracy, sensitivity, and specificity in diagnosing synovitis, bone erosion, and soft tissue swelling. In terms of reliability, the agreement between US and MRI was moderate to almost perfect. Meanwhile, a positive association between ACPA level and bone erosion was observed in patients with RA.ConclusionsUS may have a role as the initial imaging modality in patients with RA. Patients with higher ACPA levels may need more active treatment because they are more likely to have bone erosion detected by US.

Ethnic Disparities inImaging Utilization at Diagnosis of Non-Small Cell Lung Cancer.

Prior research demonstrated statistically significant racial disparities related to lung cancer treatment and outcomes. We examined differences in initial imaging and survival between blacks, Hispanics, and non-Hispanic whites. The linked Surveillance, Epidemiology, and End Results-Medicare database between 2007 and 2015 was used to compare initial imaging modality for patients with lung cancer. Participants included 28 881 non-Hispanic whites, 3123 black, and 1907 Hispanics, patients age 66 years and older who were enrolled in Medicare fee-for-service and diagnosed with lung cancer. The primary outcome was comparison of positron emission tomography (PET) imaging with computerized tomography (CT) imaging use between groups. A secondary outcome was 12-month cancer-specific survival. Information on stage, treatment, and treatment facility was included in the analysis. Chi-square test and logistic regression were used to evaluate factors associated with imaging use. Kaplan-Meier method and Cox proportional hazards regression were used to calculate adjusted hazard ratios and survival. All statistical tests were two-sided. After adjusting for demographic, community, and facility characteristics, blacks were less likely to undergo PET or CT imaging at diagnosis compared with non-Hispanic whites odds ratio (OR) = 0.54 (95% confidence interval [CI] = 0.50 to 0.59; P < .001). Hispanics were also less likely to receive PET with CT imaging (OR = 0.72, 95% CI = 0.65 to 0.81; P < .001). PET with CT was associated with improved survival (HR = 0.61, 95% CI = 0.57 to 0.65; P < .001). Blacks and Hispanics are less likely to undergo guideline-recommended PET with CT imaging at diagnosis of lung cancer, which may partially explain differences in survival. Awareness of this issue will allow for future interventions aimed at reducing this disparity.

Contrast-enhanced [18F] fluorodeoxyglucose-positron emission tomography-computed tomography as an initial imaging modality in patients presenting with metastatic malignancy of undefined primary origin.

Background:To evaluate the advantages of contrast enhanced F-18-fluorodeoxyglucose (FDG) positron emission tomography-computed tomography (PET-contrast enhanced CT [CECT]) when used as an initial imaging modality in patients presenting with metastatic malignancy of undefined primary origin (MUO).Materials and Methods:A total of 243 patients with fine needle aspiration cytology/biopsy proven MUO were included in this prospective study. Patients who were thoroughly evaluated for primary or primary tumor was detected by any other investigation were excluded from the analysis. Totally, 163 patients with pathological diagnosis of malignancy but no apparent sites of the primary tumor were finally selected for analysis. The site of probable primary malignancy suggested by PET-CECT was confirmed by biopsy/follow-up.Results:PET-CECT suggested probable site of primary in 128/163 (78.52%) patients. In 30/35 remaining patients, primary tumor was not detected even after extensive work-up. In 5 patients, where PET-CECT was negative, primary was found on further extensive investigations or follow-up. The sensitivity, specificity, positive predictive value and negative predictive value of the study were 95.76%, 66.67%, 88.28% and 85.71% respectively.Conclusions:F-18 FDG PET-CECT aptly serves the purpose of initial imaging modality owing to high sensitivity, negative and positive predictive value. PET-CECT not only surveys the whole body for the primary malignancy but also stages the disease accurately. Use of contrast improves the diagnostic utility of modality as well as help in staging of the primary tumor. Although benefits of using PET-CECT as initial diagnostic modality are obvious from this study, there is a need for a larger study comparing conventional methods for diagnosing primary in patients with MUO versus PET-CECT.

The Accessory Ossicles of the Foot and Ankle; a Diagnostic Pitfall in Emergency Department in Context of Foot and Ankle Trauma

Trauma of the foot and ankle is commonly seen in patients presenting to accident and emergency departments (1). Although, the use of Ottawa Ankle Rules has reduced unnecessary radiographs, radiography still remains the most appropriate initial imaging modality in patients with suspected fractures (2). The decision to engage in further imaging, indications for conservative treatment versus surgery and consultation with an orthopedic surgeon or radiologist, often rests on the emergency physician’s interpretation of the radiographical findings. Therefore, it is important for the emergency physician to be aware of abnormal and normal variants of bony lesions of the foot and ankle and the various radiological pitfalls that may cause confusion. Many skeletal variations of the foot and ankle are found, including different accessory ossicles and sesamoid bones. Sesamoid bone is a small rounded bone embedded within a tendon or joint capsule. Sesamoid bones are typically found in locations where a tendon passes over a joint. They prevent the friction between the tendon and the joint, protect the tendon and increase its biomechanical effect by changing the direction of pull of the tendon. On the other hand, accessory ossicles are usually derived from the failure of union of secondary ossification centers to the main bony mass. They usually remain asymptomatic and are recognized as an incidental radiographic finding (3). However, in the context of trauma, these ossicles can be misdiagnosed as avulsion fractures, or a reverse situation in which an avulsion fracture can be evaluated as an accessory ossicle is possible. This pictorial review summarizes the most common accessory ossicles found around the foot and ankle and the fractures that may cause confusion with the accessory ossicles and sesamoid bones Abstract

Stress Testing and Non-Invasive Coronary Angiography in Patients with Suspected Coronary Artery Disease: Time for a New Paradigm

Diagnosis and management of coronary artery disease represents major challenges to our health care system, affecting millions of patients each year. Until recently, the diagnosis of coronary artery disease was possible only through cardiac catheterization and invasive coronary angiography. To avoid the risks of an invasive procedure, stress testing is often employed for an initial assessment of patients with suspected coronary artery disease, serving as a gatekeeper for cardiac catheterization. With the emergence of non-invasive coronary angiography, the question arises if such a strategy is still sensible, particularly, in view of only a modest agreement between stress testing results and the presence of coronary artery disease established by cardiac catheterization. Much data in support of the diagnostic accuracy and prognostic value of non-invasive coronary angiography by computed tomography have emerged within the last few years. These data challenge the role of stress testing as the initial imaging modality in patients with suspected coronary artery disease. This article reviews the clinical utility, limitations, as well as the hazards of stress testing compared with non-invasive coronary artery imaging by computed tomography. Finally, the implications of this review are discussed in relation to clinical practice.

Tracheobronchial aspiration of foreign bodies: current indications for emergency plain chest radiography

The purpose of this study was to determine the role of plain chest radiography in the evaluation of patients with suspected foreign-body aspiration. During a 5-year period, 31 patients (18 men and 13 women; age range 6 months to 85 years) were referred to our observation for clinical suspicion of foreign-body aspiration. Clinically, the patients presented with cough in 27/31 cases (87.1%), decreased breath sounds in 22/31 (71%), choking in 18/31 (58.1%), fever in 7/31 (22.6%) and cyanosis in 5/31 (16.1%). Suspected foreign-body aspiration had occurred 2-72 h before hospitalisation. Within 2 h of hospitalisation, all patients underwent plain chest radiography performed in the upright position (two projections) in 10/31 (32.3%) patients and in the supine decubitus position in the remaining 21 (67.7%) patients. Plain chest radiography was subsequently integrated with multislice computed tomography (MSCT) of the chest in 3/31 (9.7%) patients and with bronchoscopy in 27/31 (87.1%) patients. Plain chest radiography showed the presence of a foreign body in the tracheobronchial tree in 7/31 (22.6%) patients, who subsequently underwent successful bronchoscopy in all cases. Foreign bodies included tooth fragment (three cases), nail (two cases), metallic spiral of a ball-point pen (one case) and an earring (one case). In the remaining 24/31 patients, plain chest radiography was positive in 14 cases, showing atelectasis (seven cases), pneumonia (six cases), pulmonary hyperinflation (one case) and pneumomediastinum (one case). Such findings had been caused by an aspirated foreign body, which was subsequently removed by means of bronchoscopy in all 14 patients. Moreover, three of the remaining ten patients with negative plain chest radiograph were submitted to MSCT of the chest, which required in 1 case tracheobronchial aspiration of a foreign body that was subsequently removed by means of bronchoscopy. Overall, plain chest radiography showed the presence of foreign-body aspiration and/or pleuroparenchymal lesions in 21/31 patients (67.7%); bronchoscopy was positive in 23/27 patients (85.2%), localising the foreign body in the right main bronchus in 16/27 patients (59.3%), left main bronchus in 7/27 patients (25.9%), intermediate bronchus in 2/27 patients (7.4%) and right lower lobe bronchus in 2/27 patients (7.4%). No late complications were observed within 6 months of hospital discharge. Plain chest radiography remains the initial imaging modality for patients with clinically suspected tracheobronchial aspiration of a foreign body. Nevertheless, in the case of negative chest radiography and a clinical suspicion of foreign-body aspiration, MSCT-possibly integrated with virtual bronchoscopy-should be considered in order to avoid unnecessary bronchoscopy.

Intravenous Urography in Evaluation of Asymptomatic Microscopic Hematuria

In 2001, the American Urologic Association Best Practice Policy Panel recommended CT or intravenous urography (IVU) over ultrasonography as the initial imaging modality in patients with asymptomatic microhematuria. We here present results of a study initiated many years ago and completed prior to 2001 that provides information pertinent to the use of IVU as the initial imaging modality for such patients. This study compared the results of IVU and ultrasonography in patients 40+ years of age who were referred to a single urology department for evaluation of microscopic hematuria between 1994 and 2000. There were 290 patients who agreed to participate by undergoing ultrasonography in addition to IVU; 247 completed both tests. There were 81 men and 166 women with a mean age of 56.4 years (range 40-86 years). Thirty patients (12%) were smokers. A renal lesion or mass suggestive of tumor was found in 8 patients (3.2%); 3 patients had this finding on the IVU examination and 5 on ultrasonography. None of the patients had such a lesion/mass on both examinations. Two patients with suspect lesions were ultimately found to have renal-cell carcinoma. Both of the patients with renal cancer had a suspect lesion on the ultrasound examination but not on the contemporaneous IVU. Intravenous urography may miss lesions/masses that lead to a diagnosis of upper-tract neoplasia.

Value of somatostatin receptor scintigraphy: A prospective study in gastrinoma of its effect on clinical management

BACKGROUND & AIMS: Recently [111In-DTPA-D-Phe1]-octreotide was approved for somatostatin receptor scintigraphy (SRS) of gastroenteropancreatic tumors. SRS and other tumor localization methods can be time consuming, expensive, and involve patient inconvenience. The role of SRS in comparison to other tumor localization modalities remains undefined because the relative effects of these methods on management have not been studied. The aim of this study was to determine whether SRS alters clinical management in Zollinger-Ellison syndrome.METHODS: One hundred twenty-two consecutive patients were studied prospectively. Each patient was assigned to one of five different clinical categories. Conventional imaging studies (ultrasonography, computerized tomography, magnetic resonance image, angiography, and bone scan) were performed, and the management was proposed. SRS was then performed. Clinical management was reassessed, and whether SRS altered management was determined based on six criteria.RESULTS: SRS was superior to any single imaging study. SRS altered management in 47% overall and in 22%- 60% of patients in the five different clinical categories. Primary tumor localization and clarification of equivocal localization results from conventional studies were the principal reasons for altering management. SRS was equally useful in patients with or without metastatic liver disease.CONCLUSIONS: Because of the ability of SRS to alter clinical management combined with its superior sensitivity, high specificity, simplicity, and cost-effectiveness, SRS should be the initial imaging modality for patients with gastrinomas.(Gastroenterology 1997 Feb;112(2):335-47)

MR and CT Diagnosis of Carcinoid Heart Disease

This report describes findings present on magnetic resonance (MR) imaging and computed tomography (CT) in a patient with carcinoid heart disease. Major abnormalities included thickening and immobility of the tricuspid valve leaflets and disturbed flow patterns indicative of tricuspid stenosis and regurgitation demonstrated with cine MR. While echocardiography is usually the initial imaging modality in patients with carcinoid heart disease, other modalities such as MR and CT may provide correlative or supplemental information.

Zollinger-Ellison syndrome: prospective assessment of abdominal US in the localization of gastrinomas.

The ability of abdominal ultrasound (US) to help localize gastrinomas was prospectively studied in 79 patients with Zollinger-Ellison syndrome. The results were assessed by means of laparotomy, autopsy, or percutaneous liver biopsy. For hepatic gastrinoma, US had a sensitivity of 63% and a specificity of 100%, with a positive predictive value of 100% and a negative predictive value of 89%. US was slightly less sensitive for detecting gastrinoma in the liver than were computed tomography (CT) (66%) and selective angiography (78%). For detection of extrahepatic gastrinoma, US had a sensitivity of 30%, a specificity of 94%, a positive predictive value of 100%, and a negative predictive value of 25%. US enabled detection of tumor in eight cases not detected with CT and in four not detected with angiography. Specificity for extrahepatic gastrinoma was similar for all three modalities (89%-95%). CT and US were equally effective for the detection of extrahepatic gastrinoma, and angiography was significantly more effective than both US and CT (P less than .01). The authors conclude that US, although of low sensitivity, remains useful as the initial imaging modality in patients with Zollinger-Ellison syndrome.