Nevus

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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 ?
Benign Spitz nevi are well-circumscribed and symmetric melanocytic lesions comprising epithelioid and/or spindled nevomelanocytes with prominent nucleoli.
Sunscreen use proved to have no impact on the increase in melanocytic nevi counts over time, which was similar in all three groups (Int.
Immunoperoxidase staining also helps to differentiate dermatofibromas from hyalinizing Spitz nevi: neoplastic cells of dermatofibromas express factor XIIIa whereas tumor cells of hyalinizing Spitz nevi express S-100 protein.
In contrast, nevi classified dermoscopically as reticular occur on the trunk and extremities with similar frequency, he continued.
Round excision and punch excision may be better alternatives than conventional fusiform excision of benign dome-shaped or papular nevi of the face, as more tissue is preserved.
Architecturally, ICN can seem concerning because they frequently show reverse maturation, which is rarely seen in benign skin nevi.
Shields and colleagues at Wills Eye Institute in Philadelphia studied the medical records of 2,514 consecutive eyes of patients with choroidal nevi between 1974 and 2006.
1-fold greater prevalence of dysplastic nevi than those who were born earlier, reported Dr.
The nevi were then irradiated ex vivo with UV at 4,000 [J/m.
One prospective study followed 55 patients after removal of nevi from the head and neck.
They answered written questionnaires about their eye and hair color; their acute and chronic exposure to the sun; their skin color after such exposures; their histories of tanning and sunburns; their use of tanning salons; and the number of asymmetric nevi on their legs, from toes to groin.