naevus

ne·vus

, pl. nevi (nē'vŭs, -vī) 1. A circumscribed malformation of the skin, especially one that is colored by hyperpigmentation or increased vascularity; a nevus may be predominantly epidermal, adnexal, melanocytic, vascular, or mesodermal, or a compound overgrowth of these tissues. 2. A benign localized overgrowth of melanin-forming cells of the skin at birth or appearing early in life.
Synonym(s): mole (1) , naevus. [L. naevus, mole, birthmark]

naevus

Any coloured growth or mark on the skin present at birth. A birthmark. From Latin naevus , a spot or blemish.

naevus

any birthmark, usually a sharply defined reddish patch on the skin.
a pigmented mole on the skin.

naevus

Any localized area of pigmentation or vascularization of the skin or eye tissues, usually benign and congenital. Note: also spelt nevus. Plural: naevi.
choroidal naevus A benign accumulation of melanocytes in the choroid. It affects some 10% of the population. Ophthalmoscopically it appears as a slate-grey lesion, flat or minimally elevated, oval or circular. It is asymptomatic. With time drusen may also appear. See melanocyte; choroidal melanoma.
conjunctival naevus A naevus located on the conjunctiva, most often near the limbus. It appears as a yellowish-red area or deeply pigmented mass usually before the age of 20. A pigmented conjunctival naevus must be distinguished from an acquired melanoma of the conjunctiva which occurs later in life (after the third decade, is typically unilateral and may become malignant). A conjunctival naevus rarely becomes malignant. It can be excised if cosmetically undesirable or has enlarged to such a degree as to irritate the eye.
flammeus naevus See Sturge- Weber syndrome.
iris naevus A pigmented spot of variable size on the surface of the iris. It is composed of an accumulation of melanocytes in the iris stroma. It is usually benign but occasionally it may transform itself into a malignant melanoma. See melanocyte; iris melanoma; ICE syndrome.
naevus of Ota A benign, congenital, usually unilateral, accumulation of melanocytes on the cheek, eyelids, forehead, nose or sclera. Some naevi may become malignant melanoma. Syn. oculocutaneous melanosis; oculodermal melanocytosis. See ocular melanocytosis; melanosis.

ne·vus

, pl. nevi (nē'vŭs, -vī) Circumscribed dermal malformation, especially if hyperpigmented or with increased vascularity; may be predominantly epidermal, adnexal, melanocytic, vascular, or mesodermal, or a composite.
Synonym(s): naevus[L. naevus, mole, birthmark]

单词	naevus
释义	naevus naevus or nevus n, pl -vi (-vaɪ) (Medicine) any congenital growth or pigmented blemish on the skin; birthmark or mole. Also called: naeve [C19: from Latin; related to (g)natus born, produced by nature] ˈnaevoid, ˈnevoid adj Translations nævus naevus naevus (US), nevus any congenital growth or pigmented blemish on the skin; birthmark or mole naevus ne·vus , pl. nevi (nē'vŭs, -vī) 1. A circumscribed malformation of the skin, especially one that is colored by hyperpigmentation or increased vascularity; a nevus may be predominantly epidermal, adnexal, melanocytic, vascular, or mesodermal, or a compound overgrowth of these tissues. 2. A benign localized overgrowth of melanin-forming cells of the skin at birth or appearing early in life. Synonym(s): mole (1) , naevus. [L. naevus, mole, birthmark] naevus Any coloured growth or mark on the skin present at birth. A birthmark. From Latin naevus , a spot or blemish. naevus any birthmark, usually a sharply defined reddish patch on the skin. a pigmented mole on the skin. naevus Any localized area of pigmentation or vascularization of the skin or eye tissues, usually benign and congenital. Note: also spelt nevus. Plural: naevi. choroidal naevus A benign accumulation of melanocytes in the choroid. It affects some 10% of the population. Ophthalmoscopically it appears as a slate-grey lesion, flat or minimally elevated, oval or circular. It is asymptomatic. With time drusen may also appear. See melanocyte; choroidal melanoma. conjunctival naevus A naevus located on the conjunctiva, most often near the limbus. It appears as a yellowish-red area or deeply pigmented mass usually before the age of 20. A pigmented conjunctival naevus must be distinguished from an acquired melanoma of the conjunctiva which occurs later in life (after the third decade, is typically unilateral and may become malignant). A conjunctival naevus rarely becomes malignant. It can be excised if cosmetically undesirable or has enlarged to such a degree as to irritate the eye. flammeus naevus See Sturge- Weber syndrome. iris naevus A pigmented spot of variable size on the surface of the iris. It is composed of an accumulation of melanocytes in the iris stroma. It is usually benign but occasionally it may transform itself into a malignant melanoma. See melanocyte; iris melanoma; ICE syndrome. naevus of Ota A benign, congenital, usually unilateral, accumulation of melanocytes on the cheek, eyelids, forehead, nose or sclera. Some naevi may become malignant melanoma. Syn. oculocutaneous melanosis; oculodermal melanocytosis. See ocular melanocytosis; melanosis. ne·vus , pl. nevi (nē'vŭs, -vī) Circumscribed dermal malformation, especially if hyperpigmented or with increased vascularity; may be predominantly epidermal, adnexal, melanocytic, vascular, or mesodermal, or a composite. Synonym(s): naevus[L. naevus, mole, birthmark] ThesaurusSeenevus
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