skin neoplasm dysplastic nevus dysplastic nevi Dani Welter NCIt:C3694 Clinically atypical nevi (usually exceeding 5 mm in diameter and having variable pigmentation and ill defined borders) with an increased risk for development of non-familial cutaneous malignant melanoma. Biopsies show melanocytic dysplasia. Nevi are clinically and histologically identical to the precursor lesions for melanoma in the B-K mole syndrome. (Stedman, 25th ed) nevus syndrome, dysplastic SNOMEDCT:61814002 MedDRA:10013961 DOID:10041 MESH:D004416 dysplastic nevus syndrome