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Because of the nerve symptoms and the topography of sometimes beginning 1 to 2 days before or after d. The pain is intense and in-free interval that grad-after a few years, it be-lthough in one case (9), ring pregnancy (which isthe lesion, our preoperative diagnosis was an atypical neu-rogenic tumor with a cystic or hemorrhagic content. Sur-gery revealed a purplish mass, which was situated within the piriform muscle, and extended below and outside in contact with the sciatic nerve. The whole region was in-flamed. Section of the tumor released a chocolate color the first day of a perio progressive, with a pa ually shortens until, comes permanent. A pain disappeared duSciatic Endometriosis: MR Evaluat