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 ?
The diagnosis of epidermal nevus syndrome should be considered when there is a nevus with associated developmental abnormality of the central nervous system, eyes, or musculoskeletal systems.
Mandelbaum, "Involucrin in the differential diagnosis between linear psoriasis and inflammatory linear verrucous epidermal nevus: A report of one case," Anais Brasileiros de Dermatologia, vol.
Cafe-au-lait macules, Port wine stain, CMN and Epidermal nevus remains for life and can be treated for cosmetic purpose.
Psoriasis overlying an epidermal nevus. Arch Dermatol.
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.
It was later described by various names by other authors like nevus verrucous, systematized epidermal nevus and epidermolytic hyperkeratosis.Gianotti,6 in 1980, classified it as a localized form of congenital epidermolytic hyperkeratosis.
Common differential diagnoses for PEODDN include porokeratosis of Mibelli, linear psoriasis, and linear epidermal nevus. Linear porokeratosis and porokeratosis of Mibelli are characterized by sharply demarcated hyperkeratotic annular lesions with distinct keratotic edges but do not have eccrine gland involvement on histopathology.
On histopathological examination of 85 cases, 11 were classical Lichen planus and 09 were its morphological variants (Figure 2); 5 cases of Psoriasis, 5 cases of Prurigo nodularis, 4 cases of Morphea (Figure 3), 4 cases of Lichen simplex chronicus, 3 cases of Lichen striatus, 3 cases of Verruca plana, 3 cases of Becker nevus, 2 cases of Pemphigus foliaceus, 2 cases of Linear epidermal nevus (Figure 4), 2 cases of Macular amyloidosis, 2 cases of Lentigo simplex, 2 cases of LSEA and one case each of other lesions as shown in Table 1.
Abstract Verrucous epidermal nevus is a common type of keratinocyte hamartoma present at birth or occurring later in life.
Another common skin manifestation in PS is the linear verrucous epidermal nevus. Slowly evolving Cerebriform Connective Tissue Nevus (CCTN) is also reported.
This overlaps with the histologic picture of epidermal nevus and can be differentiated from it by the presence of malformations of the dermis most prominently hyperplasia and malpositioning of the sebaceous glands.6
The clinical Differential diagnosis like Proteus syndrome, Klippel-Trenaunay syndrome, Epidermal nevus syndrome and other vascular malformations were considered and the relevant investigations were carried out.