| nevus | <dermatology, tumour> Tumour like but nonneoplastic hamartoma of skin. A vascular naevus is a localised capillary rich area of the skin (strawberry birthmark, sometimes the much more extensive port wine stain). A mole benign melanoma) is a pigmented naevus, a cluster of melanocytes containing melanin. (13 Nov 1997) |
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| nevus anaemicus | A functional developmental defect in vascular filling characterised by pale, round or oval, flat lesions, indistinguishable from surrounding normal skin on diascopy. (05 Mar 2000) |
| nevus angiectodes | <dermatology> Red or purple-coloured vascular skin markings that develop shortly after birth. Most are usually painless and benign and sharply demarcated from surrounding skin, usually located on the head and neck, and grow rapidly. It is caused by proliferation of immature capillary vessels in active stroma, and is usually present at birth or occurs within the first two or three months of life. Some lesions (cavernous haemangioma) will disappear or become harder to see as the child approaches school age. Localised steroid injections have been used successfully to reduce the size of a birthmark but generally they undergo spontaneous regression and involution without scarring and normally require no treatment. (07 Mar 2000) |
| nevus arachnoideus | spider angioma |
| nevus araneus | spider angioma |
| nevus cavernosus | Vascular malformation composed of sinusoidal vessels without a large feeding artery; can be multiple, especially if inherited as an autosomal dominant trait. Synonym: nevus cavernosus. (05 Mar 2000) |
| nevus cell | The cell of a pigmented cutaneous nevus that differs from a normal melanocyte in that it lacks dendrites. A-type, melanocytes in the epidermis in pigmented nevi, resembling epithelial cells and frequently containing melanin. Nevus cell, B-type, small, usually non-pigmented melanocytes in the mid-dermis in pigmented nevi. Nevus cell, C-type, non-pigmented spindle-shaped melanocytes in the lower dermis in pigmented nevi. Synonym: nevocyte. (05 Mar 2000) |
| nevus comedonicus | Comedo nevus, congenital or childhood linear keratinous cystic invaginations of the epidermis, with failure of development of normal pilosebaceous follicles. Synonym: nevus follicularis keratosis. (05 Mar 2000) |
| nevus elasticus of Lewandowski | An obsolete term for plaques of smooth or nodular papules, skin-or ivory-coloured, occurring symmetrically on the trunk or extremities; now known to be a collagenous nevus. (05 Mar 2000) |
| nevus, epithelioid and spindle cell | A benign compound nevus occurring most often in children before puberty, composed of spindle and epithelioid cells located mainly in the dermis, sometimes in association with large atypical cells and multinucleate cells, and having a close histopathological resemblance to malignant melanoma. The tumour presents as a smooth to slightly scaly, round to oval, raised, firm papule or nodule, ranging in colour from pink-tan to purplish red, often with surface telangiectasia. (12 Dec 1998) |
| nevus flammeus | Flame nevus, a large congenital vascular nevus having a purplish colour; it is usually found on the head and neck and persists throughout life. See: Sturge-Weber syndrome. Synonym: port-wine mark, port-wine stain. (05 Mar 2000) |
| nevus follicularis keratosis | Comedo nevus, congenital or childhood linear keratinous cystic invaginations of the epidermis, with failure of development of normal pilosebaceous follicles. Synonym: nevus follicularis keratosis. (05 Mar 2000) |
| nevus, intradermal | A nevus in which nests of melanocytes are found in the dermis, but not at the epidermal-dermal junction. Benign pigmented nevi in adults are most commonly intradermal. (12 Dec 1998) |
| nevus lipomatodes | Unsatisfactory terms for a lesion that is basically a melanocytic nevus, mixed adipose cells in the dermis. Synonym: nevus lipomatodes, nevus lipomatosus. Origin: nevus + lipoma (05 Mar 2000) |
| nevus lymphaticus | A cutaneous lymphangioma. (05 Mar 2000) |