system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Malignant transformation to melanoma is common in:March 2009
assistant
The correct answer is  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