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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 .
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.
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.
Atypical (dysplastic) nevus: This type of nevus must be diagnosed based on histological features. Clinically, atypical nevi are characterized by variable pigmentation and irregular borders. [5] Becker's nevus; Blue nevus (rarely congenital): A classic blue nevus is usually smaller than 1 cm, flat, and blue-black in color. [6] Hori's 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 ...
Melanocytic nevi and neoplasms are caused by either a proliferation of (1) melanocytes, or (2) nevus cells, a form of melanocyte, but which lack dendritic processes. Contents Top
[1] [2]: 625 It is usually congenital in origin or appears within the first three decades. [3] A pedunculated lipofibroma is a solitary variant of nevus lipomatosus superficialis. It usually appears in adult life, and usually on the axilla, knee, ear, arm, scalp and the lower trunk. [3]