congenital nevus

con·gen·i·tal ne·vus

a melanocytic nevus that is visible at birth, is often larger than an acquired nevus, and more frequently involves deeper structures. Congenital nevus larger than 20.0 cm in diameter, termed giant congenital nevi, have a 6-12% lifetime risk of developing melanoma.
See also: bathing trunks nevus.
Farlex Partner Medical Dictionary © Farlex 2012

con·gen·i·tal ne·vus

(kŏn-jen'i-tăl nē'vŭs)
A melanocytic nevus that is visible at birth, is often larger than an acquired nevus, and more frequently involves deeper structures.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
In older patients, this rule does not apply; in these instances, a melanoma arising in a congenital nevus will typically demonstrate a conventional in situ component.
The teledermoscopic diagnoses were pigmented basal cell carcinoma (3), intradermal nevus (6), seborrheic keratosis (4), benign melanocytic lesion (12), blue nevus (3), intracorneal hematoma (1), atypical nevus melanocytic suspicion (2), dermatofibroma (1), congenital nevus (1), solar lentigo (2), and melanoma (4).
The clinical differential diagnosis for NS includes seborrheic keratosis, congenital nevus, and epidermal nevus.
The literature does not show any satisfactory form of treatment for congenital nevus of such dimensions.
As a congenital nevus, NS can be classified into three distinct clinical types (1, 2); small if it is less than 1.5 cm, medium if it varies from 1.5 to 19.9 cm, and large if its diameter exceeds 20 cm.
Lesion type Peripheral-only pink (lesion type total) Invasive melanoma (*) 21 (126); 16.7% (**) Melanoma in situ 22 (170); 12.9% Nevus without atypia 18 (271); 6.6% Dysplastic nevus, mild atypia 26 (461); 5.6% Dysplastic nevus, moderate atypia 2 (70); 2.86% Congenital nevus 18 (192); 9.4% Lesion type Central-only Pink throughout pink entire lesion Invasive melanoma (*) 15 (126); 11.9% 80 (126); 63.5% Melanoma in situ 23 (170); 13.5% 115 (170); 67.7% Nevus without atypia 54 (271); 19.9% 181 (271); 19.9% Dysplastic nevus, mild atypia 103 (461); 22.3% 268 (461); 58.1% Dysplastic nevus, moderate atypia 13 (70); 18.6% 48 (70); 68.6% Congenital nevus 47 (192); 24.5% 101 (192); 52.6% (*) Median Breslow depth: 0.41 mm.
Certain lesions are said to be precursor lesions of melanoma, including the common acquired nevus, dysplastic nevus, congenital nevus and cellular blue nevus (19).
A third type, the congenital nevus, is one that was present at birth, is completely elevated, has separate borders, but has stippled pigmentation (dots of darker color scattered throughout).
When a congenital nevus is more than eight inches in diameter, it poses the greatest risk.
Fast forward 15 years and ask a teen with a large (but not giant) hairy congenital nevus if she wants it off.

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