"Flow-void" sign at MR imaging: a rare finding of extracranial head and neck schwannomas.
The authors present two cases of extracranial head and neck schwannomas that exhibited the "flow-void" sign at MR imaging. In the described cases, MR images showed intratumoral signal voids, which corresponded to dilated vessels. Dynamic contrast-enhanced CT also demonstrated dilated vessels within the tumors on the arterial phase and tumor parenchymal enhancement on the delayed phase. Histopathologic examinations of excised specimens revealed thin-walled, dilated abnormal vessels with or without hyaline degeneration. Schwannoma should be considered when MR images demonstrate the "flow-void" sign in extracranial head and neck tumors.
Kato
Hiroki
H
Department of Radiology, Gifu University School of Medicine, Gifu, Japan. hkato@gifu-u.ac.jp
Kanematsu
Masayuki
M
Mizuta
Keisuke
K
Aoki
Mitsuhiro
M
Kuze
Bunya
B
Ohno
Takatoshi
T
Oshima
Koji
K
Hirose
Yoshinobu
Y
D000328:Adult; D001932:Brain Neoplasms / Q000175:diagnosis; D006258:Head and Neck Neoplasms / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D009442:Neurilemmoma / Q000175:diagnosis*; D035583:Rare Diseases / Q000175:diagnosis; D055815:Young Adult