Pilomatrix carcinoma.

Pilomatrixomas are uncommon tumors of hair matrix origin. They are characteristically benign, calcifying lesions. Eleven cases of aggressively invasive pilomatrixomas have been reported, and this variant has been termed pilomatrix carcinoma. This report presents the first known case of a cervical pilomatrix carcinoma. Modified radical neck dissection was necessary for tumor extirpation. Pilomatrix carcinoma behaves similarly to an aggressive basal cell carcinoma. These lesions require definitive, anatomic resection, careful histological examination of margins, and systematic follow-up examinations.