Nevus

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naevus

(US), nevus
any congenital growth or pigmented blemish on the skin; birthmark or mole
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

nevus

[′nē·vəs]
(medicine)
A lesion containing melanocytes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
17 cases of Lichen striatus, 5 cases of Linear Lichen planus, 2 cases of inflammatory linear verrucous epidermal nevus, Paederus dermatitis, Lichen nitidus and 1 case of Hypomelanosis of Ito and Linear and whorled nevoid hypermelanosis were encountered.
Fine mapping of the locus for nevoid basal cell carcinoma syndrome on chromosome 9q.
Nevoid basal cell carcinoma syndrome (NBCCS) is characterized by multiple jaw keratocysts, basal cell carcinomas, macrocephaly, facial milia, skeletal anomalies, and ectopic calcification of the falx.
Correlating imaging and histopathology of an odontogenic keratocyst in the nevoid basal cell carcinoma syndrome.
Mutations in the human homologue of the Drosophila patched gene in Caucasian and African-American nevoid basal cell carcinoma syndrome patients.
Linear and whorled nevoid hypermelanosis: unique clinical presentations and their possible association with chromosomal abnormality inv (9).
Unilateral nevoid telangiectasia associated with ipsilateral melorheostosis.
Several proof-of-principle studies showed potential applications of FISH to solve a variety of diagnostic dilemmas in the evaluation of melanocytic tumors, including differentiating blue nevus-like metastasis from blue nevus, mitotically active nevus from nevoid melanoma, and dysplastic nevus from superficial spreading melanoma.
Nevus comedonicus (NC), first reported by Kofmann in 1895, is a rare hamartoma of pilosebaceous unit resulting in numerous keratin-filled comedones, arranged in linear nevoid pattern.1 It is also known as comedo nevus, nevus follicularis keratosis, nevus acneiformis unilateralis, and nevus zoniforme.2
Analyzing such a morphologically gray area, it can be found to contain a certain number of melanocytic lesions, conceptually and biologically well defined but morphologically intermediate or problematic, that may be difficult to diagnose (considered MITs); this group includes some common nevi, some halo nevi, some nevi in special sites, some dysplastic nevi, some combined nevi, nevi with marked fibrosis (recurrent or not recurrent), some Spitz nevi, some Reed nevi, some blue nevi, some nevoid melanomas, and some nevoid lentiginous melanomas.
Similarly, melanomas that show nevoid morphology may display a low Ki67 index.