Female, 26 years. Skin lesion, breast
Intradermal naevus with ‘atypical junctional melanocytic proliferation’
Solitary junctional large melanocytes are not uncommon within the epidermis overying a dermal naevus. They are large but monomorphic and do not ascend into the upper parts of the epidermis. There is no suspicion of in situ melanoma.
Okamura JM, Barr RJ, Cantos KA. Benign atypical junctional melanocytic hyperplasia associated with intradermal nevi: a common finding that may be confused with melanoma in situ. Mod Pathol. 2000; 13: 857-60.