title: Ultrasonographic study of malignancies of extra-hepatic bile ducts.
mesh_terms: D002759:Adenoma, Bile Duct / Q000175:diagnosis*; D000328:Adult; D000368:Aged; D002779:Cholestasis / Q000175:diagnosis; D003138:Common Bile Duct Neoplasms / Q000175:diagnosis*; D005260:Female; D005706:Gallbladder Neoplasms / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000175:diagnosis; D014463:Ultrasonography