atypical melanocytic hyperplasia

a·typ·i·cal me·la·no·cyt·ic hy·per·pla·si·a

proliferation of melanocytes showing nuclear atypicality, especially as scattered single cells high in the epidermis; interpreted by some pathologists as malignant melanoma in situ.
References in periodicals archive ?
I wonder if we [at Scripps] diagnose melanoma in situ more often, as opposed to others who might sign it out as atypical melanocytic hyperplasia or another worrisome diagnosis.
About 5% of melanoma patients have subsequent melanoma
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