title: [Value of B-mode ultrasonography screening in the early diagnosis of carcinoma of the head of the pancreas and the ampulla].
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000175:diagnosis; D000368:Aged; D014670:Ampulla of Vater; D003138:Common Bile Duct Neoplasms / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000175:diagnosis*; D014463:Ultrasonography