title: Acute onset of intracranial subdural hemorrhage five days after spinal anesthesia for knee arthroscopic surgery: a case report.
abstract: BACKGROUND
  Spinal anesthesia is a widely used general purpose anesthesia. However, serious complications, such as intracranial subdural hemorrhage, can rarely occur.
  
  
  METHODS
  We report the case of a 73-year-old Japanese woman who had acute onset of intracranial subdural hemorrhage five days after spinal anesthesia for knee arthroscopic surgery.
  
  
  CONCLUSIONS
  This case highlights the need to pay attention to acute intracranial subdural hemorrhage as a complication after spinal anesthesia. If the headache persists even in a supine position or nausea occurs abruptly, computed tomography or magnetic resonance imaging of the brain should be conducted. An intracranial subdural hematoma may have a serious outcome and is an important differential diagnosis for headache after spinal anesthesia.
authors.affiliation: The Sports Medicine and Knee Center, Kofu National Hospital, 11-35 Tenjin-cho, Kofu, Yamanashi 400-8533, Japan. tmhagino@amber.plala.or.jp.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Hagino
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ochiai
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Shinya
authors.initials: S
authors.lastname: Senga
authors.forename: Masanori
authors.initials: M
authors.lastname: Saito
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Naganuma
authors.forename: Eiichi
authors.initials: E
authors.lastname: Sato
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Haro