epidermoid cyst n a cystic tumor containing epidermal or similar tissue called also epidermoid see CHOLESTEATOMA
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1. epidermal c. 2. a benign tumor in the skull, meninges, or brain, formed by inclusion of epidermal elements, especially at the time of closure of the neural groove. It may grow gradually because of accumulations of desquamated debris and may become calcified. Called also epidermoid, epidermoidoma, and epidermoid tumor. 3. epidermal inclusion c.Medical dictionary. 2011.