Abstract:Merkel cell carcinoma (MCC) is a rare neoplasm that arises in the skin of elderly patients on sun‐exposed areas such as the head, neck, and extremities. Involvement of the epidermis by tumor cells is a relatively uncommon phenomenon. However, a few cases have been reported of Merkel cell carcinoma in situ (MCCIS) in which tumor cells are confined exclusively to the epidermis without dermal involvement. Herein, we present a peculiar MCCIS lesion in a 66‐year‐old man composed of tumor cells in a nested and lenti… Show more
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