Canadian Medical Guide > Diseases > Neoplasms > Neoplasms by Histologic Type > Nevi and Melanomas > Nevus Terms and Definitions




Nevus

Medical Definition: A circumscribed stable malformation of the skin and occasionally of the oral mucosa, which is not due to external causes and therefore presumed to be of hereditary origin. The excess (or deficiency) of tissue may involve epidermal, connective tissue, adnexal, nervous, or vascular elements. (Dorland, 27th ed)
Guide Notes: /blood supply /chem /secret /ultrastruct permitted; coord IM with SKIN NEOPLASMS (IM) + site (IM or NIM) if relevant; BASAL CELL NEVUS SYNDROME & DYSPLASTIC NEVUS SYNDROME are also available
Nevus Categories.
Canadian Medical Guide Definition Dysplastic Nevus Syndrome - Clinically atypical nevi (usually exceeding 5 mm in diameter and having variable pigmentation and ill defined borders) with an increased risk for development of non-familial cutaneous malignant melanoma. Biopsies show melanocytic dysplasia. Nevi are clinically and histologically identical to the precursor lesions for melanoma in the B-K mole syndrome. (Stedman, 25th ed)
Canadian Medical Guide Definition Nevus, Blue - Usually a benign tumor, that commonly presents as a solitary blue nodule with spindled melanocytes covered by smooth skin. Several variants have been identified, one variant being malignant. The blue color is caused by large, densely packed melanocytes deep in the dermis of the nevus. In children, they usually occur on the buttocks and lumbar area. Malignant blue nevi are more commonly found on the scalp.
Canadian Medical Guide Definition Nevus, Intradermal - A nevus in which nests of melanocytes are found in the dermis, but not at the epidermal-dermal junction. Benign pigmented nevi in adults are most commonly intradermal. (Stedman, 25th ed)
Canadian Medical Guide Definition Nevus, Pigmented - A nevus containing melanin. The term is usually restricted to nevocytic nevi (round or oval collections of melanin-containing nevus cells occurring at the dermoepidermal junction of the skin or in the dermis proper) or moles, but may be applied to other pigmented nevi. (From Dorland, 27th ed)

Nevus Medical Definitions and Terms

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