title: The surgical management of symptomatic peripheral nerve sheath tumors.
abstract: OBJECTIVE
  To determine the clinical presentation and morbidity of the surgical management of peripheral nerve sheath tumors (PNSTs).
  
  
  METHODS
  We performed a retrospective chart review of surgically treated PNSTs at the University of Miami between 1991 and 2008.
  
  
  RESULTS
  There were a total of 140 cases, including 87 schwannomas, 34 neurofibromas, and 19 malignant peripheral nerve sheath tumors (MPNSTs). The average age of the total study group was 49.0 years; it was significantly lower for patients with neurofibroma. There was a high correlation between neurofibroma tumors and neurofibromatosis-1. Most patients with benign tumors presented with a painful mass, paresthesias, or numbness without significant weakness. Patients who had previously undergone attempted resections and preoperative biopsy had a significantly increased risk (41%) for developing postoperative neurologic deficits when compared with patients who presented with de novo tumors (15%). Intraoperative monitoring appeared to reduce the risk of postoperative motor deficit, particularly in neurofibromas. Most MPNSTs (>80%) were diagnosed at stage IIB or higher and had a combined mortality rate of 31.6% at 78 months. Tumor size was the best predictor of adverse outcome, as all MPNST mortalities occurred in patients with a tumor size of more than 7 cm.
  
  
  CONCLUSIONS
  PNSTs are a heterogeneous group of lesions. Benign tumors respond well to marginal excision, whereas MPNSTs are aggressive sarcomas that require multimodal management. There was a significantly increased risk of postoperative neurologic deficits in patients who had undergone a previous biopsy, and thus tertiary referral without biopsy is recommended when a PNST is suspected.
authors.affiliation: Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, Florida, USA. Alevi@med.miami.edu
authors.forename: Allan D
authors.initials: AD
authors.lastname: Levi
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Ross
authors.forename: Esteban
authors.initials: E
authors.lastname: Cuartas
authors.forename: Rabah
authors.initials: R
authors.lastname: Qadir
authors.forename: H Thomas
authors.initials: HT
authors.lastname: Temple
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D018317:Nerve Sheath Neoplasms / Q000175:diagnosis / Q000601:surgery*; D009442:Neurilemmoma / Q000175:diagnosis / Q000601:surgery*; D009455:Neurofibroma / Q000175:diagnosis / Q000601:surgery*; D009493:Neurosurgery / Q000379:methods*; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult