Malignant transformation to melanoma is common in:March 2009: (A) Dermal nevus, (B) Junctional nevus, (C) Congenital nevus, (D) Lentigo nevus
Answer is B. Ans. B: Junctional nevusIntradermal nevus: Benign; <1cm diameter, single, well-defined, circular, elevated, brown sometimes with black spotsa and nonulcerated.Junctional nevus: Premalignant: source for most malignant melanomas; looks like intradermal nevus but larger, often ulcerated, irregular border and heterogeneous coloration. Suspect melanoma if junctional nevus is getting darker or larger or bleeding or itching.Spitz nevus/spindle and epithetliod cellnevus is a red-pink nodule; often confused with hemangioma clinicallyBlue nevus is black-blue nodule; often confused with melanoma clinically