めまいとの関連が疑われた内側型高位頸静脈球の1例

A case of medial type of high jugular bulb suspected to be associated with vertigo

はじめに

　高位頸静脈球は，頸静脈球が中耳腔に突出する外側型と，錐体内側に突出する内側型に分類される。内側型高位頸静脈球と内耳の位置関係は多彩で，解剖学的には蝸牛，前庭，後半規管，内耳道，前庭水管，蝸牛小管と接触しうるため，内耳症状を生じる可能性がある。今回われわれは，めまい症状をきっかけに発見された内側型高位頸静脈球の1例を経験したので，若干の文献的考察を加えて報告する。

　We report a case of a high jugular bulb that was discovered after dizziness.

　The patient visited our department with chief complaint of vertigo due to sound stimulation. Computed tomography revealed that the right jugular bulb protruded inside the cone and was in contact with the vestibular aqueduct. The symptoms may have been due to the high jugular bulb being in contact with the vestibular aqueduct or some minor malformation of the inner ear accompanying the high jugular bulb.

　Overall, physicians should keep in mind the fact that a high jugular bulb can cause various symptoms.