Abstract
<h2>Summary</h2> A case of sudden deafness due to a jugular foramen tumor has been documented with detailed neurotological findings. From neurotological findings the presence of a cerebellopontine angle tumor, specifically an acoustic neurinoma was suggested. In surgery, a large cerebellopontine angle tumor was found and this tumor pushed upon cranial nerves VII and VIII and some of the lower cranial nerves. Following the removal of this tumor, it was ascertained that its origin was from the jugular foramen and that the internal auditory canal was intact. Generally, the mechanism of sudden deafness due to a cerebellopontine angle tumor has been obscure. However, in this case, sudden deafness might presumably have originated from vascular occlusion due to pressure on the VIII cranial nerve and the labyrinthine artery.
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