Skin & Subcutaneous Tissue

{"ops":[{"insert":"Congenital melanocytic nevi: overview"},{"insert":"\n","attributes":{"header":1}},{"insert":"As the name suggests, congenital melanocytic nevi (CMN) present either at birth or arise within the first year of life; a smaller number present later in life, once their pigmentation increases.\r\n\r\nCMN can occur over any part of the body. Based on their maximum diameter, they are classified as small (\u003C1.5 cm), medium (1.5-19.9 cm), or giant (\u226520 cm). Their morphology is variable, although most lesions are oval or round in shape.\r\n\r\nCMN range from tan to back-brown in color. Their borders are usually well defined, while their surface texture can be papular, rugose, verrucous, or cerebriform.\r\n\r\nSmall and medium CMN have a small risk of malignant transformation; this risk is markedly higher in giant CMN, with 3-40% demonstrating malignant t"}]}

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