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| Nevus Classification and external resources |
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| Photograph of a nevus on an arm | |
| ICD-10 | I78.1 |
| ICD-9 | 448.1, 216.0-216.9 |
| MeSH | D009506 |
Nevus (or naevus, plural nevi, from nævus, Latin for birthmark) is the medical term for sharply-circumscribed[1] and chronic lesions of the skin. These lesions are commonly named birthmarks and moles. By definition, nevi are benign. Histologically, nevi are differentiated from lentigines (also a type of benign pigmented macule) by the presence of nests of melanocytes, which lentigines (plural form of lentigo) lack.
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Classification
- Melanocytic nevus (nevomelanocytic nevus, nevocellular nevus): benign proliferation of melanocytes, the skin cells that make the brown pigment melanin. Hence, most nevi are brown to black. They are very common; almost all adults have at least one, usually more. They may be congenital or acquired (usually at puberty).
- Epidermal lesions:
- Epidermal nevus: congenital, flesh-colored, raised or warty, often linear lesion, usually on the upper half of the body.
- Nevus sebaceus: variant of epidermal nevus on the scalp presenting as a hairless, fleshy or yellowish area.
- Connective tissue lesions:
- Connective tissue nevus: fleshy, deep nodules. Rare.
- Vascular lesions. See birthmark for a more complete discussion:
- Hemangioma (strawberry mark or nevus).
- Nevus flammeus (port-wine stain).
- Spider angioma (nevus araneus).
- Blue Rubber Bleb Nevus Syndrome: dilatation of veins anywhere in the body (both skin and internal organs), usually lethal from internal hemorrhage. It is a very rare genetic disorder.
See also
References
External links
- Nevus risk factors, symptoms, treatment, and more information
- Atlas of Pathology Section of a melanocytic nevus
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Wikipedia content modification information:
- This page was last modified on 13 October 2008, at 02:16.
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