Dura-based giant intracranial schwannoma in the middle fossa.
A 49-year-old female presented with a rare giant schwannoma arising from the dura mater of the middle fossa manifesting as loss of left visual acuity. Magnetic resonance imaging revealed a heterogeneously enhanced giant mass in the left middle fossa. Surgery via the transsylvian approach confirmed the origin of the tumor between the left internal carotid artery and the trigeminal nerve in the lateral wall of the cavernous sinus. Elongated abducens nerve was confirmed, but no tumor adhesion to the abducens nerve was found. The tumor was closely attached to the dura mater of the middle fossa and the lateral wall of the cavernous sinus. The histological diagnosis was schwannoma. Both left oculomotor and abducens nerve pareses occurred immediately after the operation but gradually resolved over 3 months. The operative findings indicated that this schwannoma may have arisen from the meningeal branch of the trigeminal nerve in the dura mater of the middle fossa.
Inui
Toshitaka
T
Department of Neurosurgery, Osaka Police Hospital, Osaka, Japan. inutoshi@naramed-u.ac.jp
Morimoto
Tetsuya
T
Koshimae
Naoki
N
Nagata
Kiyoshi
K
Aketa
Shuta
S
Hironaka
Yasuo
Y
Tei
Rinsei
R
D002426:Cavernous Sinus / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D035301:Cranial Fossa, Middle / Q000473:pathology* / Q000601:surgery; D003390:Cranial Nerve Neoplasms / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D004388:Dura Mater / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008488:Medical Illustration; D008577:Meningeal Neoplasms / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D008875:Middle Aged; D009442:Neurilemmoma / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D019635:Neurosurgical Procedures; D011183:Postoperative Complications; D016896:Treatment Outcome; D014276:Trigeminal Nerve / Q000473:pathology; D020433:Trigeminal Nerve Diseases / Q000473:pathology / Q000503:physiopathology / Q000601:surgery