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White epidermoid cyst transformation after stereotactic radiosurgery: illustrative case

Hideki Matsumoto, Yuki Shinya, Satoru Miyawaki, Masahiro Shin, Satoshi Koizumi, Daisuke Sato, Munetoshi Hinata, Masako Ikemura, Satoshi Kiyofuji, Taich Kin, Mototaro Iwanaga, Masahiro Shimizu, Hirofumi Nakatomi, and Nobuhito Saito

epidermoid cysts composed of keratin and cholesterol crystals. 2 A case of typical epidermoid cysts transformed into WECs has been reported previously. 3 However, none of those prior reports discussed the potential contribution of radiation. In the present report, we present a case of a WEC transformed from histologically confirmed typical epidermoid cysts 14 years after stereotactic radiosurgery (SRS). Illustrative Case History, Examination, and Imaging A 55-year-old man presented with left trigeminal neuralgia (TN), and radiological examinations revealed a