Nevus

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Related to nevi: Melanocytic nevi, Dysplastic Nevi

naevus

(US), nevus
any congenital growth or pigmented blemish on the skin; birthmark or mole

Nevus

 

(mole, birthmark), a congenital malformation of the skin in which some areas differ in color from the rest of the skin and/or have a peculiar warty appearance. Nevi are not confined to any particular area. They can be present at birth or develop during the first few years of life or even later.

Vascular nevi, or hemangiomas, are characterized by varying sizes, uneven edges, and a pink or bluish red color. They become pale when pressed and may be flat, superficial (capillary nevi), or nodular. They are embedded in the thickest part of the skin and have an uneven cavernous surface (cavernous nevi). Verrucoid nevi occur as singular or multiple patches of different shapes, are muddy gray or brown in color, and have an uneven keratotic surface. Pigmented nevi are light brown to almost black in color; they can be the size of a pinhead, or they can cover large areas of the skin. The surfaces of pigmented nevi may be uneven and covered with hair (Becker’s nevi).

Self-treatment of pigmented spots is dangerous because frequent injury may cause them to degenerate into melanomas, whereupon the nevi enlarge, become firmer, and change color. New pigmented spots may appear in the same area, and the regional lymph nodes may become enlarged.

Electrocoagulation, cryotherapy, surgical dissection, and radiotherapy are used to treat nevi.

REFERENCE

Shanin, A. P. “Nevusy.” In Mnogotomnoe rukovodstvo po dermatologii, vol. 3. Moscow, 1964.

I. IA. SHAKHTMEISTER

nevus

[′nē·vəs]
(medicine)
A lesion containing melanocytes.
References in periodicals archive ?
In a linked Perspective, Barbara Fuhrman and Victor Cardenas said that additional studies should be carried out to investigate further and they hope that this research will provide etiologic insights and test practical uses of nevi and related phenotypes for their potential utility in breast cancer risk assessment.
The findings of this study contradict an earlier study that said fewer nevi indicated an increased risk of severe eczema.
The device objectively assesses up to 75 factors to differentiate melanoma from low-grade and high-grade dysplastic nevi, Dr.
of the Colorado School of Public Health, University of Colorado, Denver, and colleagues examined the link between tanning and number of nevi.
Compared with benign nevi, melanoma is more likely to be associated with a confluence of atypical single cells, nests of various sizes and shapes, and migration of the melanocytes above the basal zone into the upper layers of the epidermis or extension down adnexal structures (pagetoid spread) (figure 2).
SAN DIEGO -- Pregnant women who present with changing nevi should not be treated differently from other patients of similar age, Dina R.
Suster, (1) in 1994, described a variant of Spitz nevi characterized by Spitz nevus cells in a paucicellular dermal stroma.
The number and type of nevi (the medical term for moles -- singular, nevus) on the entire body were systematically reported.
Whether or not they play a role in future vaccines, he says, they could be used during diagnosis to separate malignant melanoma from so-called dysplastic nevi, moles that resemble melanomas but and benign.
Upon meeting, and immediately connecting with, James McNeill at his hotel Principe delle Nevi (Web - http://www.