[Cytohistologic and immunohistochemical characteristics of the aortic intima and media in coarctation of the aorta of the adult type].

Introduction: Classically, coarctation of the aorta has been divided into infantile and adult forms. The vascular malformation responsible for coarctation is a defect of the vessel intima and media giving rise to a prominent posterior infolding ("the posterior shelf") which, in some cases, may extend around the entire circumference of the aorta. Histological examination of the coarcted aortic segment discloses intimal and medial lesion consisting of thickened ridges that protrude posteriorly into the aortic lumen.

[Two cases of pancreatic head polypeptide tumors, one with a central cavity which fistulized into the duodenum].

PP omas are rare, usually malignant tumours of the PP cells of the Langerhan's islets which secrete pancreatic polypeptide. The authors present two women operated for PP-omas of the pancreas. The first was 55 year-old woman in whom we did a cephalic duodenopancreatectomy (Whipple's procedure) for the tumor of the head of the pancreas with central cavity containing gas due to communication with the duodenum.