Question:
A melanocytic nevus of which type is most likely to undergo malignant transformation?
A melanocytic nevus of which type is most likely to undergo malignant transformation?
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Malignant change risk is highest where nevus cells are still active, right at the dermo-epidermal junction.
Updated On: Jul 8, 2026
- Blue nevus
- Junctional
- Epidermal
- Deep dermal
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question asks which type of melanocytic nevus (mole) carries the highest risk of turning into malignant melanoma. The options describe different nevus types by where their melanocyte nests sit.
Step 2: Key Formula or Approach:
Recall the classification of common acquired melanocytic nevi based on the location of nevus cell nests: junctional (at the dermo-epidermal junction), compound (both junction and dermis), and intradermal (dermis only), plus special types such as blue nevus. Malignant change risk tracks with active proliferation at the junctional zone.
Step 3: Detailed Explanation:
A junctional nevus has its melanocyte nests confined to the dermo-epidermal junction, where the cells are still relatively active and proliferating. This actively dividing junctional population is the one most associated with malignant transformation, so junctional nevi (and the junctional component of compound nevi) carry the highest transformation risk among common nevus types.
A blue nevus is a deep dermal collection of spindled, heavily pigmented melanocytes. It is generally benign with a very low rate of malignant change, and malignant blue nevus is rare.
An "epidermal" nevus cell location is not a standard part of the melanocytic nevus classification tested here (true epidermal nevi arise from keratinocytes, not melanocytes), so it does not fit this framework.
A deep dermal or intradermal nevus has its nevus cells confined within the dermis, away from the epidermis. These mature, settled cells are the least active and carry a low risk of malignant transformation, which is why common intradermal moles in adults are usually left alone.
Step 4: Final Answer:
Malignant transformation is most linked to the junctional nevus, where the melanocyte nests are still active at the dermo-epidermal junction.
\[ \boxed{\text{Junctional}} \]
The question asks which type of melanocytic nevus (mole) carries the highest risk of turning into malignant melanoma. The options describe different nevus types by where their melanocyte nests sit.
Step 2: Key Formula or Approach:
Recall the classification of common acquired melanocytic nevi based on the location of nevus cell nests: junctional (at the dermo-epidermal junction), compound (both junction and dermis), and intradermal (dermis only), plus special types such as blue nevus. Malignant change risk tracks with active proliferation at the junctional zone.
Step 3: Detailed Explanation:
A junctional nevus has its melanocyte nests confined to the dermo-epidermal junction, where the cells are still relatively active and proliferating. This actively dividing junctional population is the one most associated with malignant transformation, so junctional nevi (and the junctional component of compound nevi) carry the highest transformation risk among common nevus types.
A blue nevus is a deep dermal collection of spindled, heavily pigmented melanocytes. It is generally benign with a very low rate of malignant change, and malignant blue nevus is rare.
An "epidermal" nevus cell location is not a standard part of the melanocytic nevus classification tested here (true epidermal nevi arise from keratinocytes, not melanocytes), so it does not fit this framework.
A deep dermal or intradermal nevus has its nevus cells confined within the dermis, away from the epidermis. These mature, settled cells are the least active and carry a low risk of malignant transformation, which is why common intradermal moles in adults are usually left alone.
Step 4: Final Answer:
Malignant transformation is most linked to the junctional nevus, where the melanocyte nests are still active at the dermo-epidermal junction.
\[ \boxed{\text{Junctional}} \]
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