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 ?
Birkac ay once basvurdugu bir baska dermatoloji kliniginde lezyonlarin epidermal nevus olabilecegi belirtilmisti.
Ayirici tanida baslica dermatozis neglekta, akantozis nigrikans, noro-dermatit, iktiyoz, tinea versikolor, Gougerot-Carteaud sendromu, epidermal nevus yer almaktadir.
Epidermal nevus epidermal verrucous nevus keratinocytes zosteriform.
A provisional diagnosis of verrucous epidermal nevus was made and a punch biopsy was done.
All benign tumors cystic, vasculogenic, non-cystic like epidermal inclusion cyst, pyogenic granuloma, epidermal nevus, keratocanthoma, and neurofibroma were included in the study.
We kept the differential diagnosis of inflammatory linear verrucous epidermal nevus and linear psoriasis and sent a skin biopsy for histopathologic examination.
In over half of the reported cases, a pigmented or epidermal nevus has been present, but not always at the same site.
Linear LP as a variant of LP may present as Koebner phenomenon, isolated linear lesions, lichenoid epidermal nevus, segmental LP, zosteriform LP, and BILP.
The differential diagnosis includes incontinentia pigmenti and epidermal nevus.
The differential diagnosis includes tuberculosis verrucosa cutis, linear epidermal nevus, verrucous carcinoma, eccrine nevus, pyogenic granuloma.
Occasionally these may be familial and may occur in association with Goldenhar syndrome or epidermal nevus syndromes.
Linear verrucous epidermal nevus, condyloma acuminata and bowenoid papulosis were excluded by history and histopathological data.