Endometriosis of the Digestive Tract is an uncommon pathology, especially when ileocecal appendix is involved. Authors report twelve cases of appendiceal endometriosis reviewed from surgical and anatomopathological records. The preoperative diagnosis is almost imposible. The most usual clinical presentation is compatible with that of acute or chronic appendicitis. The definitive diagnosis is confirmed by anatomopathological study of the surgical specimen. The Surgical treatment consists of appendicectomy alone or associated with extirpation of other concomittant neighbouring lesions.