title: A 30-year-old man with a mass in the distal left thigh and radiating leg pain.
abstract: The following case describes the imaging and clinical findings of a condition of interest to the orthopaedic surgeon. Initial history, physical findings, and imaging examinations are presented here for your consideration. The final clinical diagnosis and relevant discussion can be found on the following pages.
authors.affiliation: Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, Missouri.
authors.forename: M M
authors.initials: MM
authors.lastname: Marushack
authors.forename: K D
authors.initials: KD
authors.lastname: Merkel
authors.forename: L A
authors.initials: LA
authors.lastname: Gilula
mesh_terms: D000328:Adult; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009456:Neurofibromatosis 1 / Q000150:complications; D018319:Neurofibrosarcoma / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D010146:Pain / Q000209:etiology; D013848:Thigh