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Hepatobiliary and pancreatic: Commentary

nodules. Biliary cystadenocarcinomas contain mucinous, serous, bile-tinged or brownish cloudy fluid without cells. Cholesterol crystals or necrotic and purulent material are detected occasionally. These findings account for the varying attenuation numbers among loculi. Contrast enhancement is seen along the internal septa and wall because abnormal clusters of vessels are frequently seen within the walls at angiography. While sonography is superior to CT in demonstrating internal morphology, CT is usually superior in demonstrating the size and extent of these tumours. Because preoperative evaluation of internal morphology, size and extent is necessary, CT and sonography are primary complementary examinations.