Giant nevus - Definition

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A giant nevus, commonly referred to as the giant congenital nevus, is a very rare form of nevus, generally called a mole but of a much larger size than a normal specimen. A nevus is defined as giant if it has a diameter of over 20 centimeters, and in the most extreme cases, it can cover practically the entire surface of the skin. This type of nevus is present at birth, hence its categorization as a congenital nevus. It is usually accompanied by smaller nevi on the rest of the skin, and in order to avoid psychological insecurities and limit risks of it evolving into a skin cancer, which are higher with this type of nevus, ablation is often discussed on a case by case basis.