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Previous Volume 308:1515-1519 June 23, 1983 Number 25 Next

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Abstract

On the basis of clinical evaluation, the physician should decide whether extrahepatic biliary obstruction is highly unlikely, possible, or very likely. If it is highly unlikely, no further workup for obstruction is indicated unless the clinical picture is altered on follow-up examination. Further evaluation of the biliary tree is warranted in other patients. Ultrasonography is currently the noninvasive imaging technique of first choice. Computed tomography is indicated if ultrasonography has yielded technically inadequate results or in special circumstances when it is anticipated that decisions regarding further diagnostic evaluation or treatment will be importantly influenced by the results. Negative findings obtained in a technically adequate examination may represent a logical stopping point in the workup of patients in whom obstruction is considered merely a possibility to be excluded, but they should not dissuade the clinician from further diagnostic evaluation if obstruction is considered very likely. Indeed, in selected circumstances, such as cases in which choledocholithiasis is suspected after cholecystectomy, direct cholangiography is appropriate as an initial test. If evidence of obstruction is obtained by noninvasive imaging, direct cholangiography will be required in many patients before treatment, and the choice between percutaneous or retrograde cholangiography should be made on an individual basis. The challenge to the clinician is to minimize the risk, expense, and time involved in obtaining sufficient information for a definitive diagnosis and treatment.

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