Nevus
From Wikipedia, the free encyclopedia
| ICD-9 | 216.0-216.9 |
|---|
Nevus (or naevus) is a general term that refers to a number of different, usually benign, pigmented lesions of the skin. Most birthmarks and moles fall into the category of nevi.
- Melanocytic nevus: Nevus cells (melanocytes) are normally localized in the basal layer of the epidermis. Their proliferation may appear in:
- Junctional nevus: located just superficial to the junction of the epithelium and the underlying connective tissue, they are flat and not detected by palpation.
- Compound nevus: located within the interface of the epithelium and the underlying connective tissue, they are raised and solid.
- Intradermal nevus: The most common lesion of the skin, these lie exclusively within the dermis. They are regular and round, their cells having a central nucleus and single nucleolus. Some melanocytes may present melanin pigment in the cytoplasm (dark-brown, granular).
- Intramucosal nevus: Although all oral nevi are rare, these are the most commonly seen there, and they are found most frequently on the hard palate.
- Dysplastic nevus
- Blue nevus
- Blue Rubber Bleb Nevus Syndrome
- Nevus flammeus (port-wine stain)
[edit] External links
- Atlas of Pathology Section of a melanocytic nevus
- Nevus Outreach
- (French) Naevus de Becker
