title: Scoliosis secondary to a hemivertebra: seven patients with gradual improvement without treatment.
abstract: METHODS
  Retrospective case series.
  
  
  OBJECTIVE
  To make clinicians aware of this unusual natural history.
  
  
  BACKGROUND
  Nonprogressive and progressive scolioses due to hemivertebrae have been abundantly documented in the literature. There has been no article describing spontaneous improvement. Two case reports have been described elsewhere in a general article on natural history.
  
  
  METHODS
  From a previous review of 1250 patients with congenital spine deformity of all types, 7 patients were identified with spontaneous improvement of their scoliosis due to a hemivertebra during growth.
  
  
  RESULTS
  The mean curve at start of observation was 31 degrees (range: 24 degrees -43 degrees), and at the end of observation was 19 degrees (range: 10 degrees -30 degrees). Six of the curves were at the thoracolumbar region (T11-L2), and the other at T1. The average duration of follow-up was 9 years.
  
  
  CONCLUSIONS
  Spontaneous curve improvement is rare, but possible. In view of the difficulty of prediction for curves due to a hemivertebra, careful observation with careful curve measurement is recommended. Inappropriate early, aggressive surgery should be avoided.
authors.affiliation: Department of Spine Surgery, Twin Cities Spine Center, Minneapolis, MN, USA. jwinhaven@aol.com
authors.forename: Robert B
authors.initials: RB
authors.lastname: Winter
authors.forename: John E
authors.initials: JE
authors.lastname: Lonstein
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D008159:Lumbar Vertebrae / Q000002:abnormalities*; D008297:Male; D012075:Remission, Spontaneous; D012600:Scoliosis / Q000151:congenital*; D013904:Thoracic Vertebrae / Q000002:abnormalities*