title: Surgical treatment of chronic subdural hematoma based on intrahematomal membrane structure on MRI.
abstract: BACKGROUND
  To determine the optimal surgical management of chronic subdural hematoma (CSDH), we assessed which operative procedure, burr holes or small craniotomy, was more effective on 49 consecutive patients.
  
  
  METHODS
  We retrospectively classified all cases into two groups according to the intrahematomal membrane structure of CSDH on T2*-weighted magnetic resonance (MR) imaging. The first group, labeled type B, included hematomas which had no intrahematomal membrane and/or were monolayer multilobule. The second group, labeled type C, consisted of hematomas which were divided into multiple layers by the intrahematomal membrane.
  
  
  RESULTS
  The outcome of type C patients treated with burr holes was significantly inferior to that of those who underwent a small craniotomy in terms of the relative outcome of neurological grading. re-operation ratio, and postoperative hospital stay (p < 0.05). Type C hematomas treated with burr holes also had inferior outcome compared with a small craniotomy in terms of the duration of hematoma until disappearance on postoperative CT (p < 0.05).
  
  
  CONCLUSIONS
  We concluded that a considerable number of cases appeared to need craniotomy and resection of intrahematomal membrane for complete recovery in CSDH, and that T2*-weighted MR imaging could be used as a basis for selecting the operative procedure for CSDH.
authors.affiliation: Department of Neurosurgery, Nagoya City University School of Medicine, Nagoya, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tanikawa
authors.forename: M
authors.initials: M
authors.lastname: Mase
authors.forename: K
authors.initials: K
authors.lastname: Yamada
authors.forename: N
authors.initials: N
authors.lastname: Yamashita
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.forename: T
authors.initials: T
authors.lastname: Banno
authors.forename: T
authors.initials: T
authors.lastname: Miyati
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000473:pathology*; D003399:Craniotomy / Q000379:methods*; D005260:Female; D020200:Hematoma, Subdural, Chronic / Q000175:diagnosis / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012189:Retrospective Studies; D016896:Treatment Outcome; D014207:Trephining / Q000379:methods*