[Report of 2 unusual cases of abdominal pain].

We present two cases of rare abdominal pathologies, for which the initial diagnosis appeared simple but turned out to be exceptional pathologies. The first was compatible with simple lithiasic cholecystitis with choledocian obstacle, but was diagnosed as an idiopathic multifocal retroperitoneal fibrosis, also known as Ormond's disease. The second patient presented as an acute appendicitis. After a surgical exploration of the lower right quadrant, which did not allow a diagnosis, a median laparotomy was performed, leading to the diagnosis of ileo-caecal ischemic necrosis caused by lymphocytic phlebitis.