Dysplastic Nevus Syndrome

**Definition:** 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)

**Tree numbers:** - C04.557.465.625.650.510.520.001 - C04.557.665.560.260 - C04.700.305 - C16.320.700.305

**Synonyms:** - B-K Mole Syndrome - Nevus Syndrome, Dysplastic