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  • Title: [Primary oculomotor nerve palsy due to mild head injury--report of two cases].
    Author: Katsuno M, Kobayashi S, Yokota H, Teramoto A.
    Journal: Brain Nerve; 2008 Jan; 60(1):89-91. PubMed ID: 18232337.
    Abstract:
    Two patients with primary oculomotor nerve palsy due to direct mild head injury are reported. They presented with internal ophthalmoplegia, dilated nonreactive pupils, and very mild disturbance in consciousness. Except for the persistent oculomotor nerve palsy, both the patients recovered fully within one week. Neither demonstrated a history that was suggestive of a cause for their oculomotor nerve palsy. Initial CT scans demonstrated localized subarachnoid hemorrhage around the brain stem. One of the patients had sustained a fracture of the anterior clinoid process. As the underlying pathophysiologic mechanism underlying the oculomotor nerve palsy we suspected mild injury to the pupillomotor fibers at the anterior petroclinoidal ligament and that of the pupillary fibers at the posterior petroclinoidal ligament. We speculate that these perforating fibers at the anterior petroclinoidal liqament acted as a fulcrum due to downward displacement of the brainstem at the time of impact.
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