A 79-year-old man presented with a crusty yellow lesion on his scalp. Histological examination revealed ulceration of the epidermis with an underlying mass in the dermis. Immunohistochemistry showed positivity for… Click to show full abstract
A 79-year-old man presented with a crusty yellow lesion on his scalp. Histological examination revealed ulceration of the epidermis with an underlying mass in the dermis. Immunohistochemistry showed positivity for p63, and focal positivity for AE1/AE3, CK5/6 and EMA.
               
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