Abnormal course of the oculomotor nerve on the clivus combined with a petroclival meningioma: Case report

Masateru Katayama, Takeshi Kawase, Shuzo Sato, Atsuhiro Kojimal, Kazunari Yoshida

Research output: Contribution to journalArticle


The course of the oculomotor nerve on the clivus was abnormal in a patient with petroclival meningioma. He complained of gait disturbance. A gadolinium-enhanced magnetic resonance image demonstrated a 4.4-cm enhancing mass in the petroclival region. The tumor was removed via an anterior transpetrosal-transtentorial approach. Normally, the oculomotor nerve originates from the brainstem and enters the oculomotor trigone. In this patient, the oculomotor nerve entered the dura mater at the upper clivus, behind the posterior clinoid process, and coursed parallel to the basilar artery. This entrance is lower than the normal entry point of the oculomotor nerve. The abnormal entrance of the oculomotor nerve may reflect an atypical developmental relationship among the cranial nerves, meninges, and bones during embryogenesis.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalSkull Base
Issue number3
Publication statusPublished - 2002 Aug 1



  • Anatomical variation
  • Anterior transpetrosal-transtentorial approach
  • Microanatomy
  • Oculomotor nerve
  • Petroclival meningioma

ASJC Scopus subject areas

  • Clinical Neurology

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