title: [Diagnosis of benign peripheral neurilemmomas by ultrasound].
abstract: OBJECTIVE
  To investigate the peripheral nerve sheath tumors sonographic features.
  
  
  METHODS
  It was a retrospective analysis of ultrasound images and clinical manifestations which were pathologically confirmed 31 cases of peripheral nerve sheath tumors in March 2011 to November 2014 from Xuanwu Hospital.
  
  
  RESULTS
  In 14 cases of 31 patients were with a clinical touch and pressure pain, 17 cases showed superficial painless mass. Ultrasound showed hypoechoic nodules 30 cases, with an average size of (2.9 ± 1.6) cm; encapsulated, border clearance, including 1 case of cystic part; color Doppler flow imaging ultrasound: no intralesional flow signals 21 patients (21/30 patients), a small amount of blood flow signals 9 cases (9/30 patients); 2 cases of multiple lesions. Another one case of preoperative ultrasound examination showed no echo, misdiagnosed as ganglion cyst.
  
  
  CONCLUSIONS
  Hypoechoic encapsulated, border clearance, little or no blood flow is the main basis of ultrasound diagnosis schwannoma, in some cases, there may be cystic ultrasound, a small number of multiple lesions.
authors.affiliation: Department of Ultrasound, Capital University of Medical Science, Beijing 100053, China.
authors.forename: W P
authors.initials: WP
authors.lastname: Jiao
authors.forename: S
authors.initials: S
authors.lastname: Chen
authors.forename: P
authors.initials: P
authors.lastname: Wang
mesh_terms: D006801:Humans; D018317:Nerve Sheath Neoplasms; D009442:Neurilemmoma; D012189:Retrospective Studies; D018615:Ultrasonography, Doppler, Color