BENIGN RETROPERITONEAL NEURAL SHEATH TUMORS IN PATIENTS WITHOUT VON RECKLINGHAUSENS DISEASE

Benign retroperitoneal neural sheath tumors in patients without von Re cklinghausen's disease are quite rare and usually presented as isolate d case reports. There are two types of benign neural sheath neoplasms: schwannoma and neurofibroma. Confusion exists in the nomenclature of these tumors due to the disagreement upon their cell of origin. In a c ollective report from two institutions, three cases with benign retrop eritoneal neural sheath tumors are presented, and the histological fea tures, diagnostic and therapeutic options are discussed.