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 ?
OF CASES WHORLED NEVOID HYPERMELANOSIS 1 PAEDERUS DERMATITIS 2 LINEAR LICHEN PLANUS 5 LICHEN STRIATUS 17 LICHEN NITIDUS 2 INFLAMMATORY LINEAR VERRUCOUS EPIDERMAL NEVUS 2 HYPOMELANOSIS OF ITO 1 Note: Table made from bar graph.
Nevoid basal cell carcinoma syndrome in infants: improving diagnosis.
Multiple nevoid basal-cell epithelioma, jaw cysts and bifid rib: a syndrome.
An 8-year-old boy with nevoid basal cell carcinoma--a rare form of skin cancer that may cause deadly lesions from the slightest exposure to sunlight--can finally play outdoors thanks to a spacesuit.
Acquired unilateral nevoid telangiectasia syndrome, Acta Dermato-Venerologica (1997) 77:62-63.
10] Collectively, we speculate that earlier onset of HN may be associated with a more powerful genetic constituent of autoimmunity targeting nevoid melanocytes.
Nevus Lipomatosus Cutaneous Superficialis is an uncommon nevoid anomaly of the skin.
Keratocystic odontogenic tumors have been a subject of great interest because of their locally aggressive behavior, specific histopathologic characteristics, high recurrence rate, and tendency toward the development of multiple lesions, especially when they are seen in association with nevoid basal cell carcinoma syndrome.
Nevus sebaceous, also known as nevus sebaceous of Jadassohn, was first described in 1895 by Josef Jadassohn as a nevoid growth composed predominantly of sebaceous glands.
Atypical Spitz tumors resemble intradermal epithelioid tumors, usually with atypical melanocytes with nuclear pleomorphism and hyperchromatic nuclei similar to nevoid melanomas; however, unlike Spitz nevi, the nuclei of atypical Spitz tumors are more hyperchromatic and do not contain Kamino bodies, epidermal hyperplasia, or clefting around junctional melanocytic nests.
Ichthyosis hystrix is a group of rare conditions, characterized by spiny, hyperkeratotic scales in which blistering does not occur, erythroderma is mild or absent and localized and nevoid forms are more common.