抄録
A 55-year old male patient complained of tinnitus of the left ear, dizziness (oscillopsia) and left hemifacial spasm. Neurotological examination revealed clockwise horizontal-rotatory nystagmus. The nystagmus changed to counter-clockwise horizontal-rotatory during episodes of left tinnitus. Left hemifacial spasm around the eye and cheek was frequent. Vertebral angiograms revealed an abnormal loop formation of the posterior inferior crebellar artery.
These findings suggested that the symptoms were due to compression of the facial nerve and acoustic nerve by vascular structures. Microsurgery confirmed our diagnosis, and the patient was symptom-free after vascular decompression. The uses of neurotological examinations are discussed.
