Aneurysm of the anterior inferior cerebellar artery at the internal auditory meatus with arteriovenous malformation presenting as sudden hearing loss. A case report.:-A Case Report-

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A patient with sudden hearing loss and cerebellopontine angle syndrome was found to have an aneurysm of the anterior inferior cerebellar artery (RICA) at the internal auditory meatus with arteriovenous malformation (AVM). The patient was a 51-year-old male with followed by dizziness and right tinnitus. Three days after admission, he had sudden right hearing loss and vertigo. Four days later right facial palsy appeared. Neurotological examination pointed to a retrocochlear disorder. CT scan showed a AVM at the cerebello-pontine angle (C-P angle). Left vertebral angiograms demonstrated an AVM in the right cerebellar hemisphere and two aneurysms on the feeding arteries, one on the superior cerebellar artery and the other on the meatal loop of the right AICA. Removal of the AVM and clipping of the necks of the aneurysms, which were unruptured, were performed through the right suboccipital approach.Disorders presenting as sudden hearing loss and C-P angle syndrome at the same time are generally acoustic neurinomas, and vascular disorders such as aneurysms, AVM and intrameatal vascular loop are relatively rare. AICA aneurysm are very rare. Only 33 cases have been reported. A statistical analysis is included.
耳鼻咽喉科臨床学会の論文