title: Localization of post-traumatic trochlear nerve palsy associated with hemorrhage at the subarachnoid space by magnetic resonance imaging.
abstract: OBJECTIVE
  To report evaluation of traumatic trochlear nerve palsy using head magnetic resonance imaging.
  
  
  METHODS
  Observational case reports.
  
  
  METHODS
  We examined two cases involving trochlear nerve palsy after closed head injury.
  
  
  RESULTS
  Using a fluid attenuated inversion recovery pulse sequence, MRI showed a high-intensity lesion consistent with subarachnoid hemorrhage at the trochlear nerve area in the ambient cisterns.
  
  
  CONCLUSIONS
  An impact force directed toward the tentorium can be a mechanism of injury in some post-traumatic trochlear nerve palsies. Fluid attenuated inversion recovery pulse sequence is a sensitive method for detection of abnormalities in cases associated with head injury.
authors.affiliation: Ophthalmologic Service, Higashiyamato Hospital, 1-13-12 Nangai, Higashiyamato, Tokyo, 207-0014 Japan. naotoh@gw1.gateway.ne.jp
authors.forename: N
authors.initials: N
authors.lastname: Hara
authors.forename: S
authors.initials: S
authors.lastname: Kan
authors.forename: K
authors.initials: K
authors.lastname: Simizu
mesh_terms: D000293:Adolescent; D000368:Aged; D016489:Head Injuries, Closed / Q000150:complications; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D013345:Subarachnoid Hemorrhage / Q000175:diagnosis*; D013346:Subarachnoid Space; D014057:Tomography, X-Ray Computed; D014321:Trochlear Nerve / Q000473:pathology; D020432:Trochlear Nerve Diseases / Q000175:diagnosis* / Q000209:etiology; D061247:Trochlear Nerve Injuries