title: Arteriovenous malformation of the pyriformis muscle manifesting as a sciatic nerve tumor.
abstract: We present a patient with an intramuscular pelvic arteriovenous malformation that was initially diagnosed as a tumor of the sciatic nerve sheath. Endovascular embolization, attempted as a preoperative maneuver, was complicated by diffuse pulmonary emboli and death. To our knowledge, this is the first such reported case. Its presentation here broadens the differential diagnosis of sciatic nerve sheath tumors, emphasizes the diagnostic and management issues of masses presenting as peripheral nerve tumors, and provides clinicopathological evidence regarding the cause of neurological symptoms.
authors.affiliation: Division of Neurosurgery, University of Toronto, Canada.
authors.forename: M D
authors.initials: MD
authors.lastname: Cusimano
authors.forename: P M
authors.initials: PM
authors.lastname: Shedden
authors.forename: A R
authors.initials: AR
authors.lastname: Hudson
authors.forename: J M
authors.initials: JM
authors.lastname: Bilbao
mesh_terms: D000792:Angiography; D001165:Arteriovenous Malformations / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D009131:Muscle, Smooth, Vascular / Q000473:pathology; D009132:Muscles / Q000098:blood supply*; D010386:Pelvic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D010524:Peripheral Nervous System Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D011655:Pulmonary Embolism / Q000473:pathology; D012584:Sciatic Nerve / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed