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Biomedical subjects

B R Williamson

Publications and source records attributed to B R Williamson.

15 recordsLinked to original sources
PubMed1991

Left infrarenal region: anatomic variants, pathologic conditions, and diagnostic pitfalls.

Computed tomography (CT) is the preferred method for evaluating the left periaortic infrarenal region. Structures larger than 11 mm in cross-sectional diameter in this region are considered abnormal and should be evaluated for lymphadenopathy, hydroureter, or a vascular abnormality such as venous thrombosis or varicoceles. Normal structures include inferior mesenteric vessels, left gonadal vein and artery, and ureter. The diagnostic process may be complicated by variations in anatomy, including double inferior vena cava, left inferior vena cava, retroaortic left renal vein, circumaortic left renal vein, horseshoe kidney, crossed-fused renal ectopia, renal agenesis, and ureteral duplication. Familiarity with the anatomy of this region and awareness of normal variants are necessary to avoid errors in diagnosis. Radiologists should also be aware of problems in CT technique (nonopacified bowel, dynamic and unenhanced scanning) that can confuse the diagnosis.

Aneurysm↗
PubMed1979

Radionuclide bone imaging as a means of differentiating loosening and infection in patients with a painful total hip prosthesis.

Twenty patients with 23 painful total hip prostheses were examined by radionuclide imaging (20 cases), arthrography (11 cases), needle aspiration (9 cases), and surgery (19 cases) for the purpose of assessing loosening and/or infection. Bone imaging was most accurate, showing three main distributions of activity: (a) ectopic calcification, (b) focal increased activity at the upper and lower ends of the femoral prosthesis, and (c) diffuse activity. These findings suggest that infection and loosening can be differentiated in many instances. None of the patients with focal activity had infection, compared to 2 of the 3 patients with diffuse uptake.

Bone Diseases↗
PubMed1978

Radionuclide brain scan findings in superior sagittal sinus thrombosis.

Superior sagittal sinus thrombosis is a serious condition requiring early diagnosis. This paper presents our experience with two cases and describes the findings. In one case radionuclide brain imaging was the first study performed. In the other, the diagnosis was made at arteriography with scanning used for follow-up.

Adult↗
PubMed1978

Patency evaluation of a LeVeen shunt using 99mTc-sulfur colloid.

The LeVeen shunt has proved valuable in relieving intractable ascites. It is however subject to failure in about 5--8% of cases. To our knowledge there are only three reports in the literature describing the use of nuclides to assess patency; two using 99mTc-sulfur colloid and one using 99mTc-albumin. The purpose of this paper is to add our experience to the data currently published and stress that late liver visualization may occur with an obstructed shunt.

Ascites↗
PubMed1978

Poorly differentiated lymphocytic lymphoma with ectopic parathormone production: visulization of metastatic calcification by bone scan.

Metastatic soft tissue calcification is known to occur in hypercalcemia and is usually present in the kidneys, stomach and lungs. 1--3 This case presents two unusual features: 1) ectopic parathormone production in association with poorly differentiated lymphocytic lymphoma; and and 2) uptake of 99mTc-pyrophosphate in the liver in the absence of demonstrable abnormality at autopsy. The more usual sites of metastatic calcification also showed uptake of the radionuclide. We will discuss metastatic soft tissue calcification, ectopic parathyroid hormone production, hypercalcemia in malignancy and bone scan agent localization in soft tissues.

Aged↗
PubMed1978

Tumor detection with 67Ga-citrate: a literature survey (1970--1978).

Gallium scan detection of various neoplasms is tabulated by anatomic and histologic categories. The experience with many neoplasms is sufficient to accurately predict the likelihood of detection with gallium. This tabulation helps to point out other areas where the cumulative experience is insufficient to accurately predict sensitivity rates.

Citrates↗
PubMed1978

Bone scans in condensing osteitis of the clavicle.

Two additional cases of condensing osteitis of the clavicle are reported. Technetium Tc 99m phosphate bone scans were positive in both cases. Clinical and roentgenographic manifestations may allow nonoperative diagnoses of this entity which mimics metastatic disease on bone scans.

Bone Neoplasms↗
PubMed1978

Value of routine flow studies in nuclide brain scanning.

Nuclide brain scanning offers a noninvasive means of obtaining dynamic information about intracranial disease. Lesions which could be missed without the flow study are described, and other instances in which the differential diagnosis is greatly improved by the use of the vascular sequence are demonstrated. We recommend the routine use of the flow study when performing brain scans.

Brain↗
PubMed1977

Clinical evaluation of the Cleon imager.

We have compared bone images from a number of patients using three instruments. In 38 patients, Cleon body images were compared with whole-body rectilinear scans. Cleon images were also compared with scintillation camera images of the trunk or extremities of 31 patients and of the skull of 70 patients. The Cleon was superior to the rectilinear scanner in resolution, lesion detectability, and speed of scanning. The Cleon and gamma camera were comparable in lesion detection, but the Cleon was consdierably faster. Clinical studies and comparative evaluation are presented.

Bone Neoplasms↗