Abstract
In the oral cavity, epidermoid cysts usually arise in the oral floor and rarely occur in the upper lip. A case of an epidermoid cyst of the upper lip is reported. The patient was a 22-year-old man. A cyst arising in the left side of the upper lip was diagnosed by the patients former doctor, and the lesion was extirpated under local anesthesia 1 year 7 months ago. However, 6 months ago, a painless mass developed slowly on the left side of the upper lip. Palpation, revealed a large movable mass. MRI and ultrasonic examinations showed that the lesion was 25mm in diameter in the subcutaneous tissue of the left side of the upper lip. The lesion was round and homogenous inside. We diagnosed the lesion to be a cyst of the upper lip and extirpated the mass under general anesthesia. The excised material was 20×10 mm in diameter and filled with a yellowish white serous liquid and a yellowish white cheese-like material. The specimen was histopathologically diagnosed to be an epidermoid cyst. Two years after the operation, the left side of the upper lip has healed and there is no evidence of recurrence.
