Two hundred and one biopsies of the pancreas and/or extrahepatic bile ducts were performed in 173 patients using primarily ultrasound (US) or fluoroscopic guidance. Computed tomographic (CT) guidance was used twice. The success rate for detecting malignancy was 82.4%. Patients with primary ductal carcinoma had the lowest success rate. Seven complications occurred: five vasovagal reactions, one fever, and one acute pancreatitis in a patient with a normal variation, which resembled a mass. In this large series, aspiration biopsy of the pancreas and extrahepatic bile ducts proved to be a safe and reliable procedure that often can be performed on an outpatient basis. Fluoroscopic and US guidance are satisfactory for the majority of biopsies. CT guidance probably should be reserved for patients who undergo a repeat biopsy, or when US fails to adequately demonstrate the pancreas.
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