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In 103 patients with nonvisualization of
the gallbladder by conventional studies, a
positive diagnosis of biliary tract disease
was made in 75 when tomography was
added. In 62 out of 75 the actual diagnosis
was cystic duct obstruction. In the remaining 28 patients, at least
had causes other
than the gallbladder as the reason for nonvisualization.
Without tomography, approximately
of the patients would have been diagnosed
as having presumed gallbladder disease.
The need for intravenous cholangiography as a further diagnostic study has been significantly reduced.
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