“Flow-void” sign at MR imaging: A rare finding of extracranial head and neck schwannomas
✍ Scribed by Hiroki Kato; Masayuki Kanematsu; Keisuke Mizuta; Mitsuhiro Aoki; Bunya Kuze; Takatoshi Ohno; Koji Oshima; Yoshinobu Hirose
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 133 KB
- Volume
- 31
- Category
- Article
- ISSN
- 1053-1807
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✦ Synopsis
Abstract
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. J. Magn. Reson. Imaging 2010;31:703–705. © 2010 Wiley‐Liss, Inc.