title: Ultrasonographic and Clinical Characteristics of Schwannoma of the Hand.
abstract: BACKGROUND
  The purpose of this study was to report the ultrasonographic findings and clinical features of schwannoma of the hand.
  
  
  METHODS
  We enrolled 8 patients who were initially diagnosed with ganglion by ultrasonography but finally with schwannoma by a tissue biopsy. We retrospectively analyzed the ultrasonographic findings of eight patients including echogenicity, internal homogeneity, posterior enhancement, internal vascularity, and clinical manifestations such as the occurrence site, tenderness, Tinel's sign, and paresthesia before the surgery.
  
  
  RESULTS
  The occurrence sites were as follows: two cases on the thenar area, one case on the second web space, three cases on the third web space, one case on the radiovolar aspect of the proximal phalanx of the index finger, and one case on the radiovolar aspect of the proximal phalanx of the middle finger. Four patients suffered from tenderness and pain on presentation, and all patients had pain around the mass before presentation. Tinel's sign was present without paresthesia in one case. Ultrasonography revealed cystic lesions showing clear margins in all cases, and two of them had acoustic enhancement without internal flow.
  
  
  CONCLUSIONS
  It may not be easy to diagnosis schwannoma of the hand with ultrasonography alone when the lesion is small because of the similarity to the ultrasonographic findings of ganglion. Therefore, it is necessary to consider the possibility of schwannoma if a mass near the digital nerve or cutaneous nerve branch is accompanied by dull pain and tenderness.
authors.affiliation: Department of Orthopedic Surgery, Konkuk University School of Medicine, Seoul, Korea.
authors.forename: Seoung Joon
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Department of Orthopedic Surgery, Konkuk University School of Medicine, Seoul, Korea.
authors.forename: Seok Tae
authors.initials: ST
authors.lastname: Yoon
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000072716:Cancer Pain / Q000209:etiology; D005260:Female; D005385:Fingers; D006801:Humans; D008297:Male; D008875:Middle Aged; D009442:Neurilemmoma / Q000150:complications* / Q000000981:diagnostic imaging*; D010292:Paresthesia / Q000209:etiology; D010524:Peripheral Nervous System Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging*; D012189:Retrospective Studies; D014463:Ultrasonography
keywords: Hand; Schwannoma; Ultrasonography