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Nevus
A nevus is a type of hamartoma that is a circumscribed stable malformation of the skin. [from HPO]
Epithelioid cell nevus
A nevus characterized by the presence of large epithelioid melanocytes. [from NCI]
Intradermal nevus
A nevus characterized by the proliferation of nevus cells in the dermis without involvement of the dermal-epidermal junction. [from NCI]
Melanocytic nevus
A oval and round, colored (usually medium-to dark brown, reddish brown, or flesh colored) lesion. Typically, a melanocytic nevus is less than 6 mm in diameter, but may be much smaller or larger. [from HPO]
Hamartoma
A disordered proliferation of mature tissues that is native to the site of origin, e.g., exostoses, nevi and soft tissue hamartomas. Although most hamartomas are benign, some histologic subtypes, e.g., neuromuscular hamartoma, may proliferate aggressively such as mesenchymal cystic hamartoma, Sclerosing epithelial hamartoma, Sclerosing metanephric hamartoma. [from HPO]
Epithelioid cell melanoma
A melanoma characterized by the presence of malignant large epithelioid melanocytes. [from NCI]
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