Only 8 cases of mastoid cyst have been reported in the Japanese literature. A case of mastoid cyst is added along with the operative findings.
The patient was a 33-year-old male who visited our hospital on June 17, 1971 with the chief complaints of left side headache and tinnitus aurium of the left ear. X-ray examination of the mastoid revealed cystic changes in the left mastoid cavity. An extensive mastoidectomy was performed and the cyst was successfully removed but resulted in exposure and herniation of the cerebellum.
The large posterative defect was obliterated with a iliac bone graft. The postoperative course was uncomplicated.
The authors reviewed the cases appearing in the literature and discussed the etiology of the disease.
