Basal Cell Carcinoma of the Eyelid With Metaplastic Bone Formation.

Basal cell carcinoma accounts for 90% of malignant tumors of the eyelid. Basal cell carcinoma has been reported to rarely occur in conjunction with osteoma cutis or bone formation in the skin. The mechanism of this secondary osteoma cutis has yet to be explained. Herein, the authors present the case of a 68-year-old woman with a rapidly enlarging basal cell carcinoma with secondary osteoma cutis of the left lower eyelid.