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a nevus formed of a patch of dilated venules.
nevus(ne'vus) (ne'vi?) plural.nevi [L. naevus, birthmark]
1. A congenital discoloration of a circumscribed area of the skin due to pigmentation. Synonym: birthmark; mole
2. A circumscribed vascular tumor of the skin, usually congenital, due to hyperplasia of the blood vessels. See: angioma
A patch of pale skin in which blood vessels are narrowed or contracted and blood flow is locally limited.
nevus araneusSpider angioma.
A dark blue nevus covered by smooth skin. It is composed of melanin-pigmented spindle cells in the mid-dermis.
blue rubber bleb nevus
An erectile, easily compressible, bluish, cavernous hemangioma present in the skin and gastrointestinal tract.
A nevus of dilated capillary vessels elevated above the skin. It is usually treated by ligature and excision.
A horny nevus that contains a hard plug of keratin. It is caused by failure of the pilosebaceous follicles to develop normally.
A cluster of melanocytes found in both the epidermis and the dermis.
connective tissue nevus
A nevus composed of collagenous tissue.
A nevus formation on the skin.
A nevus composed of cells having some malignant characteristics.
A benign nevus often found on the scalp, having a pale or tan center enclosed within a darker encircling rim.
Raised nevi present at birth. They may be hyperkeratotic and widely distributed.
faun tail nevus
In newborns, a tuft of hair over the lower spinal column. It may be associated with spina bifida occulta.
A large reddish-purple nevus of the face or neck, usually not elevated above the skin. It is considered a serious deformity due to its large size and color. In children, these have been treated with the flashlamp-pulsed tunable dye laser.Synonym: port-wine mark; port-wine stain See: illustration
A nevus covered by a heavy growth of hair. It is usually darkly pigmented.
A papular brown nevus with an oval halo occurring in the first three decades of life. This type of nevus is usually benign but should be evaluated for malignancy.
A nevus in which the melanocytes are found in nests in the dermis and have no connection with the deeper layers from which they were formed.
Ito nevusSee: Ito nevus
A nevus in the basal cell zone at the junction of the epidermis and dermis. It is slightly raised, pigmented, and does not contain hair. This type of nevus may become malignant. See: illustration
A tumor composed of fatty connective tissue. It is probably a degenerated nevus containing numerous blood vessels.Synonym: nevolipoma
Any nevus that contains melanocytes.
A common mole. Moles may appear at any age. They are classified according to their stage of growth and whether or not they are still growing.
Ota nevusSee: Ota nevus
A congenital nevus varying in color from light yellow to black. Intradermal or nevocytic nevi are benign. Other types of nevi may become malignant. Synonym: nevus pigmentosus
Malignant or suspicious lesions should be treated by wide surgical excision. Benign lesions do not require treatment except when located at sites of friction causing bleeding or ulceration. Some nevi are removed for cosmetic reasons.
nevus pigmentosuspigmented nevus.
sebaceous nevusnevus sebaceus.
An epidermal nevus containing sebaceous gland tissue.Synonym: sebaceous nevus
spider nevusSpider angioma.illustration
A pigmented nevus with a smooth, unraised surface.
nevus spongiosus albus mucosaeWhite sponge nevus.
1. Vascular nevus.
2. Infantile hemangioma.
A nevus containing dilated capillaries.
nevus unius lateris
A congenital nevus that occurs in streaks or linear bands on one side of the body. It usually occurs between the neurotomes of the lumbar or sacral area.
A nevus in which superficial blood vessels are enlarged. Nevi of this type are usually congenital. They are of variable size and shape, slightly elevated, and red or purple in color. They generally appear on the face, head, neck, and arms, though no region is exempt. The nevi usually disappear spontaneously, but wrinkling, pigmentation, and scarring are sometimes seen.Synonym: strawberry nevus (1); nevus vascularis
nevus vascularisVascular nevus.
nevus venosusVenous nevus.
A nevus formed of dilated venules.Synonym: nevus venosus
A nevus with a raised, wartlike surface.Synonym: nevus verrucosus
nevus verrucosusVerrucous nevus.
white sponge nevus
A white, spongy nevus that may occur in the mouth, labia, vagina, or rectum. Synonym: nevus spongiosus albus mucosae