症状発現前に診断された乳突部嚢胞例

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  • Cholesterol Cyst of the Mastoid; A Case Report.

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We report a case of cholesterol cyst of the mastoid, which was revealed by CT and MRI before otologic symptoms appeared. CT findings showed destruction of the temporal bone. MR imaging showed characteristic findings of the cholesterol cyst; both T1 and T2-weighted images demonstrated abnormal high signals at the affected site in the mastoid. These findings were extremely useful in making the differential diagnosis from cholesteatoma. Surgical removal of the cyst was performed and histological findings revealed that the genesis of the cyst was based on the cholesterol granuloma. The cholesterol cyst can occur in various sites in the temporal bone, and the initial symptoms depend on the affected regions. This disease causes progressive bony destruction, but it is suspected that the asymptomatic period may be long when the cholesterol cyst occurs in the mastoid cavity, as in this reported case.

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