title: Delayed and isolated oculomotor nerve palsy following minor head trauma.
abstract: BACKGROUND
  The purpose of this study was to consider the mechanism of isolated oculomotor nerve palsy after minor head trauma.
  
  
  METHODS
  We report a rare case of delayed and isolated oculomotor nerve palsy following minor head trauma. A 19-year-old boy complained of double vision 1 day after a minor head trauma. Neuro-ophthalmic examination showed isolated left oculomotor nerve palsy. Computed tomography and magnetic resonance imaging examination revealed no abnormal findings and steroid therapy was administered for a week. Three months after the injury, the ptosis and extraocular movements had fully resolved, although the pupillary light reflex was still abnormal.
  
  
  CONCLUSIONS
  Delayed and isolated oculomotor nerve palsy may be caused by an injury at the point where the oculomotor nerve runs over the posterior petroclinoid ligament. Because edema of the damaged oculomotor nerve might result in constriction at the point where the nerve pierces the dura of the cavernous sinus, symptoms of oculomotor nerve palsy appeared late after trauma. Steroid treatment reducing edema could be effective for delayed and isolated oculomotor nerve palsy following minor head trauma.
authors.affiliation: Department of Neurosurgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Nakagawa
authors.affiliation: Department of Neurosurgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Toda
authors.affiliation: Department of Neurosurgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Shibao
authors.affiliation: Department of Neurosurgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yoshida
keywords: Minor head trauma; oculomotor nerve injury; steroid