External auditory canal eccrine spiradenocarcinoma: a case report and review of literature.

Background: Eccrine spiradenocarcinoma is a rare dermal appendage carcinoma believed to arise from transformation of a long-standing benign spiradenoma. This tumor demonstrates highly malignant biologic behavior with a high recurrence rate, frequent lymph node metastases, and overall poor survival.

Methods: We report the first case of eccrine spiradenocarcinoma arising in the external auditory canal.