Basal cell carcinoma of the nail unit treated with Mohs micrographic surgery: superficial multicentric BCC with jagged borders--a histopathological hallmark for nail unit BCC.

We present a case of basal cell carcinoma (BCC) of the nail unit with a special emphasis on superficial multicentric histopathologic type with jagged borders that was treated with Mohs micrographic surgery. Nail unit BCCs may not be as rare as previously believed and jagged borders in the superficial neoplastic buds may be a hallmark for superficial BCCs of the nail unit.