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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 .
Large, pigmented, often hairy congenital nevi. They are important because melanoma may occasionally (10 to 15%) appear in them. [citation needed] Nevus of Ito and nevus of Ota: Congenital, flat brownish lesions on the face or shoulder. [20] Nevus of Ito. Mongolian spot: Congenital large, deep, bluish discoloration which generally disappears by ...
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.
The International Classification of Diseases for Oncology (ICD-O) is a domain-specific extension of the International Statistical Classification of Diseases and Related Health Problems for tumor diseases. This classification is widely used by cancer registries. It is currently in its third revision (ICD-O-3). ICD-10 includes a list of ...
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
Benign melanocytic nevus (banal nevus, common acquired melanocytic nevus, mole, nevocellular nevus, nevocytic nevus) Blue nevus (blue neuronevus, dermal melanocytoma, nevus bleu) Blue nevus of Jadassohn–Tièche (common blue nevus, nevus ceruleus) Carney complex (LAMB syndrome, NAME syndrome) Cellular blue nevus; Centrofacial lentiginosis
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.
A Spitz nevus is a benign skin lesion.A type of melanocytic nevus, it affects the epidermis and dermis. [1]It is also known as an epithelioid and spindle-cell nevus, [2] and misleadingly as a benign juvenile melanoma, [2]: 691 and Spitz's juvenile melanoma [3]).