Evaluation of abdominal computed tomography findings in patients with COVID-19: a multicenter study

PURPOSE: To evaluate the frequency of abdominal computed tomography (CT) findings in patients with coronavirus disease-2019 (COVID-19) and interrogate the relationship between abdominal CT findings and patient demographic features, clinical findings, and laboratory test results as well as the CT atherosclerosis score in the abdominal aorta. METHODS: This study was designed as a multicenter retrospective study. The abdominal CT findings of 1.181 patients with positive abdominal symptoms from 26 tertiary medical centers with a positive polymerase chain-reaction test for severe acute respiratory syndrome coronavirus 2 were reviewed. The frequency of ischemic and non-ischemic CT findings as well as the association between CT findings, clinical features, and abdominal aortic calcific atherosclerosis score (AA-CAS) were recorded. RESULTS: Ischemic and non-ischemic abdominal CT findings were detected in 240 (20.3%) and 328 (27.7%) patients, respectively. In 147 patients (12.4%), intra-abdominal malignancy was present. The most frequent ischemic abdominal CT findings were bowel wall thickening (n = 120; 10.2%) and perivascular infiltration (n = 40; 3.4%). As for non-ischemic findings, colitis (n = 91; 7.7%) and small bowel inflammation (n = 73; 6.2%) constituted the most frequent disease processes. The duration of hospital stay was found to be higher in patients with abdominal CT findings than in patients without any positive findings (13.8 ± 13 vs. 10.4 ± 12.8 days, P < 0.001). The frequency of abdominal CT findings was significantly higher in patients who did not survive the infection than in patients who were discharged after recovery (41.7% vs. 27.4%, P < 0.001). Increased AA-CAS was found to be associated with a higher risk of ischemic conditions in abdominal CT examinations. CONCLUSION: Abdominal symptoms in patients with COVID-19 are usually associated with positive CT findings. The presence of ischemic findings on CT correlates with poor COVID-19 outcomes. A high AA-CAS is associated with abdominal ischemic findings in patients with COVID-19.

An unusual cause of duodenal obstruction: mesenteric fibromatosis in a patient with type I Mayer-Rokitansky-Kuster-Hauser syndrome.

Patients with mesenteric fibromatosis (MF) are clinically asymptomatic, with little or no focal symptoms until later in their course, at which time they complain of pain, abdominal discomfort, constipation, vomiting, abdominal mass, weight loss, and symptoms due to organ compression. Generally, it occurs as an abdominal mass but may also present in many different ways. In some cases, trauma, previous abdominal surgery, and hormonal stimulation (such as estrogen) may play a role in onset of this neoplasm. Patients with Mayer-Rokitansky-Kuster-Hauser syndrome present primary amenorrhea and may have some other anomalies, including hearing defects, heart defects, skeletal deformities, and genital neoplastic diseases. We diagnosed duodenal obstruction due to MF in a patient with type I Mayer-Rokitansky-Kuster-Hauser syndrome.

An unusual cause of intestinal obstruction: abdominal cocoon.

OBJECTIVE: abdominal cocoon is characterized by total or partial encasement of the small bowel by a thick fibrotic membrane, leading to mechanical obstruction. Here, we report two cases of abdominal cocoon; both patients presented with symptoms of intestinal obstruction. CONCLUSION: We describe the CT and sonographic features of this disease, emphasizing the role of MDCT, and discuss the preoperative diagnostic clues.

Inspiratory and expiratory HRCT findings in Behçet's disease and correlation with pulmonary function tests.

PURPOSE: The purpose of our study was to describe the pulmonary parenchymal changes of Behçet's disease using high-resolution computed tomography and to correlate them with pulmonary function tests. MATERIALS AND METHODS: Thirty-four patients with Behçet's disease (18 men, 16 women), 3 of whom were symptomatic, were included as the study group. Four of 34 patients were smokers. Twenty asymptomatic volunteers (12 men, 8 women), 4 of whom were smokers, constituted the control group. The pulmonary function tests and high-resolution computed tomography were performed for both groups. RESULTS: Inspiratory high-resolution computed tomography findings were abnormal in nine patients (26.5%) of the study group. In eight patients, there were multiple abnormalities, whereas one patient had only one abnormality. Pleural thickening and irregularities, major fissure thickening, emphysematous changes, bronchiectasis, parenchymal bands, and irregular densities, and parenchymal nodules were the encountered abnormalities. Inspiratory high-resolution computed tomography scans were normal in the control group. On expiratory scans, there was statistically significant difference between study group and control group when air trapping, especially grades 3 and 4, was compared (P<0.01). Pulmonary function tests of both the study and the control groups were in normal ranges, and there was no statistically significant difference between the two groups according to pulmonary function tests (P>0.05). DISCUSSION AND CONCLUSION: High-resolution computed tomography is sensitive in the demonstration of pulmonary changes in patients with Behçet's disease. End-expiratory high-resolution computed tomography examination is very useful and necessary to show the presence of air trapping, thus the presence of small airway disease, even if the patient is asymptomatic or has normal pulmonary function tests.

Peripheral giant cell granuloma of the mandibular condyle presenting as a preauricular mass.

Preauricular mass is a common symptom for patients presenting to the otorhinolaryngologist with parotid disease. Some rare extraparotid lesions, originating from the temporomandibular joint and the mandible itself, also share the same localization and therefore are to be taken into consideration for the differential diagnosis with parotid lesions. Giant cell granuloma (GCG) was first described by Jaffe in 1953. Peripheral GCG (PGCG) is an exophytic soft tissue lesion originating from the periodontal ligament and periosteum. It is located only within the oral cavity. Central GCG (CGCG) is an uncommon benign fibro-osseous lesion generally presenting as an expansible mass with cortical bone defect. It is generally located in the mandible. The brown tumor of hyperparathyroidism and giant cell tumor must be ruled out because of the microscopic similarities of these lesions. The first case of PGCG of the mandible condyle is presented, and attention is drawn to mandibular diseases for the differential diagnosis of the preauricular mass.

Diagnostic value of renal parenchymal density difference on unenhanced helical computed tomography scan in acutely obstructing ureteral stone disease.

OBJECTIVES: To evaluate the diagnostic value of the renal parenchymal density difference, detected using unenhanced helical computed tomography, as a secondary sign of acute obstruction due to a ureteral stone. METHODS: Fifty-five patients with acute flank pain, in whom a ureteral stone was detected on the symptomatic side using unenhanced helical computed tomography, and 22 control subjects with no urinary stone disease were included in this prospective study. Computed tomography was performed, starting from the upper poles of the kidneys down to the base of the urinary bladder. The renal parenchymal density was measured in the upper, middle, and lower portions of each kidney, and a mean value was calculated. The difference between the mean values of the two kidneys was used to predict the presence of an acutely obstructing ureteral stone. RESULTS: In 49 patients with a ureteral stone (89.1%), the difference between the parenchymal densities of the obstructed and nonobstructed kidneys was 5 Hounsfield units (HU) or greater and was lower on the obstructed side. In the remaining 6 patients (10.9%), the density difference was less than 5 HU but was still lower on the obstructed side. All subjects in the control group had a density difference of less than 5 HU. A renal parenchymal density difference of 5.0 HU or greater had 89.1% sensitivity, 100% specificity, 100% positive predictive value, 85.7% negative predictive value, and 93.4% accuracy in predicting the presence of an acute obstructing ureteral stone. CONCLUSIONS: These data suggest that the renal parenchymal density difference may be a valuable secondary sign of acute obstructing ureteral stone disease.

Massive pleural effusion in an 18-year-old girl with Ewing sarcoma.

Ewing sarcoma is a bone tumour that commonly appears between ages five and 10 in the diaphysis of the long bones and predominantly presents with pain and swelling. The case of an 18-year-old girl who presented with back pain, cough, dyspnea, weakness and fever is described. Chest radiograph showed a homogenous density in the middle and inferior zones of the right hemithorax. Thoracic computed tomography revealed a diffuse pleural effusion and a 6.99 cm x 4.45 cm solid mass composed of lobulated, small cystic lesions and calcifications in the right hemithorax. Biochemical analysis of pleural fluid showed hemorrhagic effusion and exudate. A pleural needle biopsy demonstrated solid uniform tumour cells with narrowed cytoplasm, round nuclei and uncertain nucleoli. All of the tumour cell cytoplasms stained with CD99. The pathological examination supported Ewing sarcoma. Three-phase Tc-99m methylene diphosphonate scintigraphy of the whole body showed pathological tracer uptake in a broad area of the eighth costal bone and in smaller areas of the ninth and 10th costal bones. This case is reported because Ewing sarcoma is a rare cause of pleural effusion in clinical practice among younger adults.

HRCT evaluation of the accessory fissures of the lung.

INTRODUCTION: The purpose of this study was to classify the accessory fissures of the lung and to assess their frequency by using high-resolution CT. METHODS AND PATIENTS: HRCT scans of 115 patients were prospectively reviewed. 1 mm thin sections were obtained at 10 mm intervals with a scan time of 1.9 s. The fissure and its relationship to the segmental bronchovascular structures were then evaluated on transverse sections. RESULTS: Forty-four accessory fissures were detected in 35 of 115 patients. The most common accessory fissure was the inferior accessory fissure (12%). The second most common accessory fissure was the left minor fissure (8%). The right superior accessory fissure (5%), the accessory fissure between the medial and lateral segments of the right middle lobe (5%), and the accessory fissure between the superior and inferior segments of the lingula (5%) were seen in equal frequencies. Also, intersegmental accessory fissures, namely the fissure between the anterobasal and laterobasal of both the right (1%) and the left (2%) lower lobes were detected. We found only one subsegmental accessory fissure. DISCUSSION AND CONCLUSION: The inferior accessory fissure and the left minor fissure were the most common accessory fissures in our study.

Open-mouth versus closed-mouth radiographs of the nasopharynx in the evaluation of nasopharyngeal airway obstruction.

The open-mouth and closed-mouth nasopharyngeal airway radiographs of 53 children, whose symptomatology score was concordant with nasopharyngeal airway obstruction that may be due to adenoidal enlargement, were taken and, for each radiograph, nasopharyngeal airway/soft palate (NA/SP) ratio was measured and graded using the method of Cohen and Konak. According to the statistical analysis, since closed-mouth views correlated better with the symptomatology score than the open-mouth views, if a radiological measurement is needed to evaluate the nasopharyngeal airway obstruction, closed-mouth views can be chosen.

Antrolithiasis: a retrospective study.

In this retrospective study, the computed tomography (CT) archives of paranasal sinus examinations were reviewed and three cases of antroliths are presented. The archives of paranasal sinus CT studies of 1957 patients (1023 females, 934 males, mean age 36.5 years) were surveyed. CT studies were performed using 3 mm collimation and interval in the coronal, axial or both coronal and axial planes. Three out of 1957 patients demonstrated antroliths, all in the left maxillary sinus. Associated sinusitis was detected in all three patients. Only one patient was operated. The chemical analysis of the antrolith revealed it to be a calcium oxalate stone. All the relevant literature is reviewed and only 25 other cases of true antrolithiasis were encountered. The clinical and radiological features of antroliths, as well as differential diagnosis were discussed. Antrolithiasis should be considered in any case of sinusitis, that does not respond to appropriate medical therapy.

Cytological correlation in patients who have a pre-diagnosis of thyroiditis ultrasonographically.

OBJECTIVE: Radiological-cytopathological correlation in patients who are prediagnosed ultrasonographically as thyroiditis. STUDY DESIGN: Fourty five patients with hypoechogenic, heterogeneous, and/or pseudolobulated thyroid gland sonographically were included in this prospective study. Except for the patients with subacute thyroiditis, none of the patients had a prediagnosis of thyroiditis clinically. All patients were evaluated for their thyroid gland functions and intraglandular vascularity and ultrasonography-guided fine needle aspiration biopsy (US-FNAB) was performed. RESULTS: The diagnosis of thyroiditis was confirmed in 36 patients (16 lymphocytic thyroiditis, 20 Hashimoto thyroiditis, two subacute granulomatous thyroiditis) in sonographically suspected patients. In six patients, FNAB was thyroiditis negative. The true diagnosis ratio of thyroiditis was increased up to 81.8% (%95 Confidence Interval: 0.70-0.92) by performing US-FNAB, while it was 4.5% with only clinical and laboratory findings (p=0.0001). CONCLUSION: Hypoechogenic, heterogeneous thyroid gland may be strongly related to thyroiditis, which does not have any specific radiological findings. The sonographic finding of generalized parenchymal abnormality should alert the clinician to consider diffuse thyroid disease as the underlying cause and FNAB should be performed and a follow-up examination of these patients must be continued due to the risk of neoplastic disease of thyroid.

Comparison of reliabilities of the delayed images of helical renal CT in detecting small renal masses.

The reliabilities of the delayed images of helical computed tomography (CT) in detecting renal mass lesions of 30 mm or less in diameter was compared. Nephrographic, excretory and nephrographic+excretory phase images of all patients were evaluated separately to detect mass lesions of < or = 5 and 5-30 mm. There was not any statistically significant difference in the results of three groups. Nephrographic, excretory and nephrographic + excretory phase images are not different from or superior to each other in lesion detection.

Arachnoid granulations in the transverse sinuses of a patient with ocular melanoma.

Arachnoid granulations show typical imaging features that allow their distinction from dural sinus thrombosis and intrasinus tumor. These features include a mid-lateral transverse sinus location, focality, common adjacent entering superficial veins, origin of attachment, low density on computed tomography (CT), isointensity-hypointensity on T1-weighted magnetic resonance imaging (MRI) and hyperintensity on T2-weighted MRI. We report the CT and MRI findings of incidentally detected bilateral arachnoid granulations in the transverse sinuses of a patient with ocular melanoma.

A case of missing mitral valve leaflet: radiological detection.

Intravascular foreign bodies may be introduced into the circulation as a complication of minimally invasive or interventional techniques, or during cardiac valve surgery. Prosthetic heart valve leaflets have been rarely described as intravascular foreign bodies. Herein we report a case of prosthetic heart valve leaflet embolization to the aortic bifurcation with computed tomography and ultrasonography findings, and the importance of radiographic imaging in the localization of missing leaflet fragment is pointed out.

A case of missing mitral valve leaflet: radiological detection.

Intravascular foreign bodies may be introduced into the circulation as a complication of minimally invasive or interventional techniques, or during cardiac valve surgery. Prosthetic heart valve leaflets have been rarely described as intravascular foreign bodies. Herein we report a case of prosthetic heart valve leaflet embolization to the aortic bifurcation with computed tomography and ultrasonography findings, and the importance of radiographic imaging in the localization of missing leaflet fragment is pointed out.

Transient partial amnesia complicating cardiac and peripheral arteriography with nonionic contrast medium.

The aim of this study was to present a case of disruption of the blood-brain barrier during the coronary and lower extremity angiographies with radiological and clinical findings. This condition was secondary to intraarterial use of a nonionic, monomeric contrast medium. A total of 450 cc contrast media was used. Computed tomography examination showed contrast enhancement of the right occipital and frontoparietal cortical regions, which returned to normal one day after. The patient also fully recovered from the neurological symptoms within 24 h. We discussed the possible mechanism for blood-brain barrier disruption in this case.

Primary diffuse tracheobrochial amyloidosis: case report.

Respiratory amyloidosis is a rare disease that occurs in three forms: tracheobronchial, nodular parenchymal and diffuse parenchymal involment. Tracheobronchial amyloidosis is characterized by focal or diffuse deposition of amyloid in the submucosa of the trachea and proximal bronchi. Herein, we report a case of diffuse tracheobronchial amyloidosis with plain radiography and thorax computed tomography findings.

Disseminated pneumocephalus secondary to an unusual facial trauma.

Pneumocephalus can be secondary to a postintrathecal procedure, sinus fracture, basilar skull fracture, congenital skull defect, neoplasm, gas producing organism, barotrauma, neurosurgery, paranasal sinus surgery, mask or nasal continuous positive-airway pressure. Unusual facial traumas can also be rare causes of pneumocephalus. Here, we present such a case in whom an air compressor tip injury to both eyes led to the disseminated pneumocephalus. We report this rare case with the computed tomography findings and try to explain the possible mechanism of the pnemocephalus.