Biomedical subjects
Publications and source records attributed to F M Hall.
This report documents a pulmonary infarction secondary to an angiographically proven pulmonary embolus with complicating aseptic cavitation and pneumothorax. These two rare complications of pulmonary infarction have not previously been clinically or radiographically documented to occur simultaneously. The patient recovered uneventfully.
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Twenty-seven cases of discoid lateral meniscus (DLM) were diagnosed during the course of 985 knee arthrograms; 19 had the classic discoid shape while eight were less large and believed to represent a forme fruste. Based on anatomic and arthrographic appearances, DLM was classified into six types. Criteria for the arthrographic diagnosis of intact and torn DLM are discussed. The wide variety of size and shape is believed to result from a combination of congenital and environmental factors. It is speculated that some may arise entirely secondary to trauma without congenital predisposition. Many undoubtedly remain asymptomatic: more than one-third of cases in this series were diagnosed incidentally during evaluation for symptoms and signs referrable to a torn medial meniscus.
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Sources of error in performing and interpreting knee arthrograms are discussed. Normal anatomic structures and technical factors can simulate tears in most areas of both the medial and lateral menisci. These pseudotears, as well as unrecognized true tears, occur more commonly in the posterior horn of the medial meniscus. Inferior meniscal recesses and coronary ligament irregularities of the posterior medial meniscus often represent incomplete tears. Diagnostic, etiologic, and therapeutic aspects of these recesses, or pseudorecesses, are discussed. Excessive intra-articular positive contrast medium may become localized and simulate a loose body in the joint.
Overutilization of radiological studies has become a significant economic consideration in this country. The reasons for unnecessary examinations include indirect financial benefit to physicians, medicolegal considerations, inadequate history provided to the radiologist, and simply inappropriate requests. In many radiological examinations, the indications are controversial or unknown. Recent Professional Standards Review Organization legislation will probably diminish overutilization of radiological studies, both directly through peer review and indirectly by providing comparison statistical data to facilitate better assessment of the value of individual examinations. The final common pathway of the radiological examination is the radiologist, who has the right and the duty to refuse studies, particularly when they involve risk to the patient.
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Dynamic renal studies were performed with 99mTc-diethylenetriaminepentaacetic acid (99mTc-DTPA). The results were analyzed by the method of mathematical deconvolution in order to obtain the impulse response function of the kidney. Regional analysis of the kidney was attempted by evaluating the independent responses of the renal parenchyma and renal pelvis to a bolus injection of 99mTc-DTPA.
Anteroposterior and lateral knee radiographs were obtained prior to arthrography in 200 patients. Presence and quantity of joint effusion were recorded, and radiologic criteria for the presence or absence of knee effusion were evaluated. Only the lateral projection was of value in assessing joint fluid. The fat pad separation sign was the most accurate indicator of fluid and effusions as small as 1-2 ml were recognized. There were accuracies of 88% in the diagnosis and 90% in the exclusion of knee effusions. Satisfactory lateral knee radiographs required radiologic demonstration of the entire suprapatellar area. Minimal knee flexion and a 5degrees cephalad angulation of the x-ray tube help in adequately visualizing this area.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.