Recurrent Pleomorphic Adenoma of the External Auditory Canal; A Case Report.

Parotid pleomorphic adenoma tends to recur after inadequate surgical treatment. A 57-year-old man had a recurrent pleomorphic adenoma of the left external auditory canal. The tumor was elastic hard and covered with intact auditory canal skin. A CT scan showed that the tumor was located from the posterior external auditory canal to the mastoid with bone destruction. After mastoidectomy, the tumor was removed “en bloc” with surrounding bone and skin. The histopathological diagnosis was “benign” pleomorphic adenoma. It was considered to be a recurrence of parotid tumor. Because 1) he had previously received surgical treatment twice for a parotid pleomorphic adenoma, 2) the tumor was located very close to the previous recurrent tumor. There has been no recurrence since our surgeries. We consider that it is important to control recurrent pleomorphic adenomas by adequate surgical treatment after obtaining the previous surgical records and pathological information.