title: Neurofibrosarcoma complicating von Recklinghausen's disease.
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D009455:Neurofibroma / Q000150:complications*; D009456:Neurofibromatosis 1 / Q000150:complications*; D012186:Retroperitoneal Neoplasms / Q000150:complications*