We report a new case of a cellular blue nevus with clinicopathologic atypia. It was a large lesion presenting clinically as a vascular tumor located in the middle of the back. It grew for 2 years without skin ulceration. The pathological study suggested a cellular blue nevus with moderate nuclear atypia, without any atypical mitosis and necrosis. The differential diagnosis such as malignant blue nevus and melanoma are discussed in search of a better definition of these rare lesions.
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