Giant cystic basal cell carcinoma mimicking epidermal cyst

Dear Editor, Basal cell carcinoma (BCC) is the most common malignant tumor composed of basaloid cells that arise from the basal cells of the epidermis or the epithelial structures of the adnexa. BCC has many different clinical and histological presentations. We herein report a case of cystic BCC which was clinically similar to epidermal cyst. A 91-year-old Japanese man presented with a 4-year history of a soft tumor involving his right cheek. It had recently rapidly increased in size. The physical examination revealed a cystic tumor measuring 5.0 cm · 5.0 cm, including a dark-brown lesion on the center of the surface and irregular telangiectasia on the peripheral area (Fig. 1a). No regional lymph node involvement was detectable. The blood test findings were almost completely normal. Magnetic