[Giant trichilemmal carcinoma of the retroauricular: a case report].

ABSTRACT

The trichilemmal carcinoma is a rare tumor that usually occurs on sun-exposed skin, especially on the face, scalp, neck and back of hands, mainly in elderly subjects but commonly between the 4th and 9th decades of life. We report a case of giant trichilemmal carcinoma. A 65-year-old man presented with a 5-year history of a slowly developing mass arising from his right retroauricular region, with local destruction of the auricle. The lesion appeared as a 8.0 cm×6.5 cm×2.0 cm sized, with surface ulceration and erosion, subcutaneous nodule, and mild tenderness. Preoperative pathological biopsy showed "retroauricular" trichilemmal carcinoma. The patient underwent right retroauricular tumor resection, partial auriculectomy, neck adjacent skin flap repair and auricle reconstruction. Postoperative pathological report "retroauricular" trichilemmal carcinoma. The margin of incision was negative, and the lymph nodes in zone II were negative. Immunohistochemistry Tumor cells were CK5/6（++）, p63（++）, p40（++）, CD10（-）, EMA（-）, Ki-67（+, about 60%）.