An unexpected cause of retroperitoneal gangrene.

Retroperitoneal Gangrene is a serious condition whose causes are many. We report three originally cases of anorectal suppuration complicated by retroperitoneal gangrene without Fournier's gangrene until there ever described in the literature. The diagnosis was made in all cases on CT because of atypical clinical presentation. The surgical approach was carried out in different ways to treat perineal and retroperitoneal lesions.