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Microscopically, congenital melanocytic nevi appear similar to acquired nevi with two notable exceptions. For the congenital nevus, the neval cells are found deeper into the dermis . Also, the deeper nevus cells can be found along with neurovascular bundles , with both surrounding hair follicles , sebaceous glands , and subcutaneous fat .
A Mongolian spot, also known as slate grey nevus or congenital dermal melanocytosis, is a benign, flat, congenital birthmark with wavy borders and an irregular shape. In 1883, it was described and named after Mongolians by Erwin Bälz, a German anthropologist based in Japan, who erroneously believed it to be most prevalent among his Mongolian patients.
However, a melanocytic nevus is benign, and melanoma is malignant. Most melanocytic nevi never evolve into a cancer, with the lifetime risk for an individual nevus being 1 in 3000 for men and 1 in 11 000 for women. [5] Moreover, dermatologists have a standardized system for determining whether a skin lesion is suspicious for malignant melanoma.
Congenital versus acquired. Congenital nevus: Small to large nevus present at or near time of birth. Small ones have low potential for forming melanomas, however the risk increases with size, as in the giant pigmented nevus. [18] Acquired nevus: Any melanocytic nevus that is not a congenital nevus or not present at birth or near birth.
Nevus of Ito (nevus fuscoceruleus acromiodeltoideus) Nevus of Ota (congenital melanosis bulbi, melanosis bulborum and aberrant dermal melanocytosis, nevus fuscoceruleus ophthalmomaxillaris, oculodermal melanocytosis, oculomucodermal melanocytosis) Nevus spilus (speckled lentiginous nevus, zosteriform lentiginous nevus)
Congenital melanocytic nevus is a type of melanocytic nevus, the medical term for what is colloquially called a "mole", found in infants at birth. Occurring in about 1% of infants in the United States, it is located in the area of the head and neck 15% of the time, but may occur anywhere on the body. It may appear as light brown in fair-skinned ...
Spitz nevus is the medical name for a benign mole. They share a similar appearance with other moles, some that are cancerous. Learn more here. Skip to main content. 24/7 Help. For premium support ...
Inherited dysplastic nevus syndrome is an autosomal dominant hereditary condition. Dysplastic nevi are more likely to undergo malignant transformation when they occur among members of melanoma families. At least one study indicates a cumulative lifetime risk of nearly 100% in individuals who have dysplastic nevi and are members of melanoma ...