garment nevus

Also commonly called Bathing Trunk Nevus. A premalignant congenital melanocytic nevus, which measures > 5 cm in greatest dimension and has a ‘garment-like’ distribution—bathing trunk, cap, coat sleeve, stocking—often with scattered satellite lesions; up to 12% develop melanoma; GNs may be 20 cm in greatest dimension with satellite lesions, deeply pigmented with moderate hair growth, require multiple excisions; head & neck and leptomeningeal involvement may be associated with epilepsy, mental retardation, leptomeningeal melanoma; draining lymph nodes are often pigmented, corresponding to benign nevus cell aggregates

garment nevus

Giant melanocytic nevus Dermatology A congenital pigmented nevus covering a large area, thus also designated as 'stocking', 'cap' or 'coat sleeve' nevi; GNs may be ≥ 20 cm in greatest dimension with satellite lesions, deeply pigmented with moderate hair growth, require multiple excisions; ± 12% undergo malignant degeneration; head & neck involvement may be associated with epilepsy, mental retardation, leptomeningeal melanoma; draining lymph nodes are often pigmented, corresponding to benign nevus cell aggregates. See Nevus.
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And even rarer congenital melanocytic nevus, garment nevus (also called cape or bathing-trunk nevus), have a higher incidence of melanoma.