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  • Title: Sixth cranial nerve palsy caused by compression from a dolichoectatic vertebral artery.
    Author: Zhu Y, Thulborn K, Curnyn K, Goodwin J.
    Journal: J Neuroophthalmol; 2005 Jun; 25(2):134-5. PubMed ID: 15937439.
    Abstract:
    A 68-year-old man had an unremitting left sixth cranial nerve palsy immediately after completing a long bicycle trip. High-resolution (3 Tesla) magnetic resonance imaging disclosed a dolichoectatic vertebral artery that compressed the left sixth cranial nerve against the belly of the pons at its root exit zone. It was postulated that increased blood flow in the vessel during the unusually prolonged aerobic exercise precipitated the palsy. Compressive palsies of cranial nerves caused by a dolichoectatic basilar artery have often been documented; compressive palsy caused by a dolichoectatic vertebral artery is less well-recognized.
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