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Biomedical subjects

R G Levitt

Publications and source records attributed to R G Levitt.

At least 73 records · Page 4Linked to original sources
PubMed1978

Complementary use of ultrasound and computed tomography in studies of the pancreas and kidney.

113 cases of pancreatic and renal disease studied by both ultrasound and computed tomography (CT) were analyzed retrospectively. CT provided a diagnosis when pancreatic ultrasound was unsuccessful due to overlying bowel gas or obesity and when renal ultrasound was unsuccessful due to obesity, reverberations from ribs, small lesions, or multiple lesions. Conversely, ultrasound provided a diagnosis when CT was unsuccessful due to lack of fat planes or respiratory motion. CT usualy distinguished carcinoma from pancreatitis when ultrasound showed a focal echogenic mass. CT resolved renal cyst from neoplasm when ultrasound showed a mixed echo pattern mass.

Diagnosis, Differential↗
PubMed1978

Computed tomography and radionuclide imaging of the liver: a comparative evaluation.

The authors retrospectively analyzed the results of radionuclide imaging (RI) and computed tomography (CT) of the liver in 174 patients. RI correctly identified 90% of patients with focal hepatic lesions while CT identified 85%. CT was capable of differentiating tumor, abscess/hematoma, and cyst while RI was more sensitive in the detection of hepatocellular disease. CT distinguished regenerating nodules from other focal lesions. Radionuclide imaging remains the preferred initial screening examination in patients with suspected focal liver disease, while CT is the examination of choice to distinguish obstructive from nonobstructive jaundice.

Diagnostic Errors↗
PubMed1978

Computed tomography of the adrenal gland.

Computed tomography (CT) easily and accurately demonstrates both the normal and abnormal adrenal gland. The normal adrenal gland can be seen in almost 95% of patients. With this technique, 29 of 29 proved adrenal masses were demonstrated; one case of bilateral adrenal hyperplasia could not be recognized, another showed equivocal enlargement. CT is an excellent screening and often definitive radiologic test of evaluating the adrenal gland.

Adrenal Gland Diseases↗
PubMed1978

Accuracy of computed tomography in detecting intraabdominal and pelvic adenopathy in lymphoma.

Computed tomography (CT) is a highly accurate method of detecting intraabdominal and pelvic nodal involvement in patients with lymphoma. The correlation between CT and lymphangiographic findings in this series of 80 surgically proven and nonproven cases was high (84%). CT is superior to lymphangiography in demonstrating abnormality in such areas as the high retrocrural or the mesenteric nodes where contrast material from bipedal lymphangiography does not reach. An abnormal CT scan eliminates the need for lymphangiography, and normal CT scan at 2 cm intervals can exclude retroperitoneal adenopathy with high confidence. If details of internal nodal architecture are required, a lymphangiogram can also be performed. Lymphangiography is also indicated in patients where CT is equivocal either because of lack of fat or gross motion artefacts.

Adolescent↗
PubMed1978

Detection of neoplastic involvement of the mesentery and omentum by computed tomography.

A total of 39 patients undergoing abdominal computed tomography and subsequent surgical biopsy of the mesentery or omentum were studied to evaluate the sensitivity of CT in detecting metastases to those areas. Twelve patients had negative biopsies; there were no false positive CT interpretations in that group. Of the 27 patients with positive biopsies, 18 showed positive findings on CT scan. Those patterns of involvement are described and illustrated. The nine false negative cases related to very small metastatic foci, contiguity with the primary tumor, or paucity of intraabdominal fat.

Abdominal Neoplasms↗
PubMed1977

Accuracy of computed tomography of the liver and biliary tract.

Computed tomography (CT) is a highly accurate method of detecting and clarifying the nature of space-occupying lesions within the liver. Obstructive (surgical) jaundice can be differentiated from nonobstructive (medical) jaundice very accurately using CT scanning; when obstruction is present, its level and cause can often be diagnosed. CT is not a sensitive method of detecting hepatocellular disease. Sources of error in CT scan interpretation are analyzed.

Biliary Tract Diseases↗
PubMed1977

Computed tomography of the kidney.

Computed tomography is an extremely accurate method of obtaining more definitive diagnostic information about a renal mass discovered on a urogram. Benign renal cysts are readily distinguished from solid renal neoplasms, and CT is often valuable in characterizing possible juxtarenal masses. The cause of a nonfunctioning kidney(s) on a urogram can often be discerned, and hydronephrosis is easily detected.

Adenocarcinoma↗
PubMed1977

Computed tomographic evaluation of the pancreas.

Computed tomography (CT) was used to assess possible pancreatic disease in 352 patients. It was found to be a reliable, often specific, and noninvasive method for detecting pancreatic neoplasms and pseudocysts. The use of CT has resulted in the diminished use of pancreatic angiography; effects of CT on patterns of utilization of other diagnostic methods are described.

False Negative Reactions↗
PubMed1976

Roentgenographic recognition of bronchoceles.

Bronchoceles often have characteristic plain film, tomographic, and bronchographic appearances, and they may trap air. Roentgenographic recognition of bronchoceles can allow them to be distinguished from neoplasms and sometimes help avoid unnecessary surgery.

Adolescent↗
PubMed1976

Computed tomography of the body: early trends in application and accuracy of the method.

Early experience with extracranial CT has shown this diagnostic method to be highly accurate in evaluating the liver, pancreas, kidneys, retroperitoneum, and pelvis. The diagnosis of neoplasm, inflammatory changes, and normal moophologic variants is possible. Initial data indicat that this modality may assume a primary role in the evaluation of the liver, pancreas, and retroperitoneum (e.g., the differentiation of medical from surgical jaundice and the distinction of solid from cystic lesions). In the thorax, the results appear far less dramatic. CT scans rarely surpass the diagnostic accuracy of conventional radiologic studies. Initial results indicate a need for studies comparing CT with radionuclide examinations, ultrasonography, and other conventional radiographic procedures as well as for evaluating its use in radiation therapy planning and follow-up.

Computers↗
PubMedDate not supplied

Hypoplastic superficial femoral artery associated with bilateral persistent sciatic arteries: a diagnostic pitfall.

A patient with unsuspected bilateral persistent sciatic arteries (PSAs) underwent angiography following a gunshot wound to the right thigh. A hypoplastic superficial femoral artery associated with this rare vascular anomaly was misdiagnosed as being traumatically occluded. Pitfalls in the diagnosis of PSA as well as the embryology, clinical features, and complications are discussed.

Adult↗
PubMedDate not supplied

CT observation of rib abnormalities: spectrum of findings.

The CT studies in 63 patients in which rib abnormality was identified or excluded were retrospectively analyzed. The CT features were detailed and correlated with other available radiographic findings as well as clinical data. Contiguous spread of tumor to rib or metastasis to rib characteristically showed subtle or complete segmental lytic rib destruction. An accompanying extrapleural soft tissue mass was frequently seen with metastatic disease and myeloma. In nine patients CT showed rib destruction that had been obscured on chest radiography by heart, diaphragm, mass, or pleural effusion. Other imaging studies prompted consideration of neoplasm in seven patients in whom CT clearly showed benign post-traumatic or developmental lesions. Six patients had a clinically suspected chest wall mass excluded, leading to the diagnosis of Tietze syndrome. The ribs should be carefully inspected on all CT studies of the thorax and upper abdomen. Computed tomography is helpful when other imaging techniques, such as rib films or isotopic bone scans, have not resolved the question of clinically or radiographically suspected rib abnormality.

Adolescent↗
PubMedDate not supplied

Utilization characteristics of a superconductive MR system undergoing initial clinical trial.

The authors describe their initial 7 month experience with magnetic resonance (MR) imaging using a superconductive MR system. Factors affecting system utilization were scheduled and unscheduled downtime, specific system characteristics, and physician experience with the new technology. Technical improvements that reduced the duty cycle and radiologist experience in tailoring examinations have improved patient throughput by reducing the average patient study time by approximately 40% during the 7 month survey. These considerations have important economic consequences for patients and operators of MR equipment.

Adolescent↗
PubMedDate not supplied

Diagnosis of congenital absence of left pericardium by MR imaging.

Congenital absence of the pericardium, whether partial or total, is a rare abnormality. It can be very difficult to diagnose clinically as well as to confirm radiographically. Plain film fluoroscopy and CT have been shown to be of value in differentiating this entity from others with similar findings. We report a case in which magnetic resonance was utilized to confirm the diagnosis and the findings of this new technique are described.

Adolescent↗