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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

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Hemifacial spasm caused by multiple vascular attachments due to remote compression effects of a dermoid cyst in the cerebellar hemisphere: illustrative case

Kento Hirayama, Takafumi Tanei, Takenori Kato, Toshinori Hasegawa, Eiji Ito, Yusuke Nishimura, and Ryuta Saito

posterior fossa are extremely rare, and they are located close to occipital bone at the asterion, intradural space, and cerebellar hemisphere. 3–8 These cases are summarized in Table 1 . Clinical symptoms of patients with these lesions included headache, ataxia, hearing loss, gait disturbance, dizziness, vertigo, and trigeminal neuralgia. The mechanisms of onset of these symptoms were mainly direct compression or increased intracranial pressure. Even though there is normal cerebellar tissue between the lesion and the cranial nerve, remote effects due to indirect

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Long-term survival in patients with long-segment complex meningiomas occluding the dural venous sinuses: illustrative cases

Zhishuo Wei, Arka N. Mallela, Andrew Faramand, Ajay Niranjan, and L. Dade Lunsford

trigeminal neuralgia (TGN) 24 months after her craniotomy and was treated with SRS for management of her facial pain. She underwent repeat SRS 120 months after the initial craniotomy for recurrent tumor. Repeat trigeminal GK SRS was performed three times for recurrent pain. At 243 months after the initial craniotomy, her tumor and facial pain were stable. B: The radiosurgery dose plan projected on the axial, coronal, and sagittal views for stages 1, 2, and 3 of the first and second SRS. The 214-month follow-up MRI after first GK shows stable tumor. Images obtained 2