Abstract
Three prospective studies were performed to clarify the clinical usefulness of gray-scale sonography in biliary tract (B. T.) disease. The first study compared the diagnostic accuracy of biliary tract sonography to the standard radiographic diagnostic test (OCG) in the diagnosis of elective disease of the biliary tract. Results of the study showed that biliary tract ultrasound was at least comparable to the OCG in the diagnosis of B. T. disease. The second study was performed to determine first, if the gallbladder wall could be accurately visualized by the sonographic techniques and if so, would a thickened G. B. wall reliably diagnose patients with acute disease of the B. T. Study of 106 patients and 100 controls documented the fact that the gallbladder wall was much thicker in patients with biliary tract disease than in the control population. Therefore, gallbladder wall thickening might be a potentially useful diagnostic criteria for the diagnosis of acute acalculous cholecystitis. Lastly, study of the bile duct size in 102 surgical patients established ultrasonic criteria by which to separate patients with medical from surgical jaundice.
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