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==Classification==
==Classification==
* [[mole (skin marking)|Melanocytic nevus]]: Nevus cells are normally localized in the basal layer of the [[Epidermis (skin)|epidermis]]. Their proliferation may appear in the form of a:
* [[mole (skin marking)|Melanocytic nevus]]: Nevus cells are normally localized in the basal layer of the [[Epidermis (skin)|epidermis]]. Their proliferation may appear in the form of a:
** Junctional nevus: located just superficial to the junction of the [[epithelium]] and the underlying [[connective tissue]]. A junctional nevus is flat and is not detected by palpation.
** Junctional nevus: Located just superficial to the junction of the [[epithelium]] and the underlying [[connective tissue]]. A junctional nevus is flat and is not detected by palpation.
** Compound nevus: located within the interface of the epithelium and the underlying connective tissue. A compound nevus is raised and solid.
** Compound nevus: Located within the interface of the epithelium and the underlying connective tissue. A compound nevus is 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 [[Cell nucleus|nucleus]] and single [[nucleolus]]. Some melanocytes may present [[melanin]] pigment in the cytoplasm (dark-brown, granular).
** 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 [[Cell nucleus|nucleus]] and single [[nucleolus]]. Some melanocytes may present [[melanin]] pigment in the cytoplasm (dark-brown, granular).
** Intramucosal nevus: Although all oral nevi are rare, intramucosal nevi are the most commonly seen there, as they are found most frequently on the hard palate.
** Intramucosal nevus: Although all oral nevi are rare, intramucosal nevi are the most commonly seen there, as they are found most frequently on the hard palate.
** [[Spider angioma]], also known as '''nevus araneus'''
** [[Spider angioma]], also known as nevus araneus
* [[Dysplastic nevus]]
* [[Dysplastic nevus]]
* [[Blue nevus]]
* [[Blue nevus]]
* [[Blue Rubber Bleb Nevus Syndrome]]
* [[Blue Rubber Bleb Nevus Syndrome]]
* Nevus flammeus([[port-wine stain]])
* Nevus flammeus ([[port-wine stain]])
* Giant Hairy Nevus: These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma.
* Giant Hairy Nevus: These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma.



Revision as of 15:02, 13 June 2013

Nevus
Photograph of a nevus on an arm

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List of terms related to Nevus

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Naevus

Overview

Nevus is a general term that refers to a number of different (usually benign) pigmented lesions of the skin. Most birthmarks and moles are placed into the category of nevi.

Classification

  • Melanocytic nevus: Nevus cells are normally localized in the basal layer of the epidermis. Their proliferation may appear in the form of a:
    • Junctional nevus: Located just superficial to the junction of the epithelium and the underlying connective tissue. A junctional nevus is flat and is not detected by palpation.
    • Compound nevus: Located within the interface of the epithelium and the underlying connective tissue. A compound nevus is 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, intramucosal nevi are the most commonly seen there, as they are found most frequently on the hard palate.
    • Spider angioma, also known as nevus araneus
  • Dysplastic nevus
  • Blue nevus
  • Blue Rubber Bleb Nevus Syndrome
  • Nevus flammeus (port-wine stain)
  • Giant Hairy Nevus: These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma.

References

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