Which of the following criteria is used to diagnose Malignant melanoma?
**Core Concept**
Malignant melanoma is a type of skin cancer characterized by the uncontrolled growth of pigment-producing cells called melanocytes. The diagnosis of malignant melanoma is crucial for early intervention and improving patient outcomes.
**Why the Correct Answer is Right**
The ABCDE rule is a widely accepted mnemonic to aid in the diagnosis of malignant melanoma. Each letter in the acronym represents a characteristic of the lesion that increases the likelihood of malignancy:
* **A**symmetry: The lesion is not symmetrical.
* **B**order: The border of the lesion is irregular, notched, or scalloped.
* **C**olor: The color of the lesion is not uniform, with multiple shades of brown, black, red, or blue.
* **D**iameter: The diameter of the lesion is greater than 6 mm in diameter.
* **E**volution: The lesion has changed in size, shape, or color over time.
**Why Each Wrong Option is Incorrect**
* **Option A:** The "7-12 rule" is not a recognized criterion for diagnosing malignant melanoma. While the diameter of the lesion is an important factor, the specific numbers 7-12 mm are not relevant.
* **Option B:** The "Rule of 5" is not a standard criterion for diagnosing malignant melanoma. This rule is not widely recognized or accepted in the medical community.
* **Option C:** The "Clark level" is a system used to classify the depth of invasion of malignant melanoma, but it is not a criterion for diagnosing the condition.
**Clinical Pearl / High-Yield Fact**
Remember the ABCDE rule as a quick and effective way to assess lesions for potential malignant melanoma. This mnemonic can help you identify lesions that require further evaluation and biopsy.
**Correct Answer:** C. ABCDE rule.