title: Malignant peripheral nerve sheath tumor arising from benign vestibular schwannoma treated by gamma knife radiosurgery after two previous surgeries: a case report with surgical and pathological observations.
authors.affiliation: Department of Neurosurgery, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Akamatsu
authors.forename: Kensuke
authors.initials: K
authors.lastname: Murakami
authors.forename: Mika
authors.initials: M
authors.lastname: Watanabe
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Jokura
authors.forename: Teiji
authors.initials: T
authors.lastname: Tominaga