title: [Ultrastructural study of carcinomas of pancreatic head and ampullary region].
mesh_terms: D000230:Adenocarcinoma / Q000648:ultrastructure; D014670:Ampulla of Vater / Q000648:ultrastructure; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000648:ultrastructure; D003138:Common Bile Duct Neoplasms / Q000648:ultrastructure*; D006801:Humans; D010179:Pancreas / Q000648:ultrastructure; D010190:Pancreatic Neoplasms / Q000648:ultrastructure*