Cellular blue nevus is a rare type of blue nevus, which shows blue-gray or blue brown nodules or plaques of 1 to 3cm in diameter, usually located on the buttocks or sacrum. We report a case of cellular blue nevus in a 42-year-old female. She presented with a 1x3.5cm blue-black multilobulated plaque on the dorsum of left foot since childhood. Histopathologic examination showed mixed biphasic pattern with ovoid islands of polygonal cells showing somewhat clear cytoplasm alternating with bundles with spindle cells, which are densely pigmented. Mitosis and necrosis were not identified. Overall features are consistent with cellular blue nevus.
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