Department of Radiology, Gifu University School of Medicine, Gifu, Japan.
J Magn Reson Imaging. 2010 Mar;31(3):703-5. doi: 10.1002/jmri.22071.
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.
作者报告了两例外耳道和颈部颅外 schwannoma 瘤病例，其在磁共振成像（MRI）上显示“流空”征。在所描述的病例中，MRI 图像显示肿瘤内信号缺失，与扩张的血管相对应。动态对比增强 CT 也显示在动脉期肿瘤内扩张的血管，以及在延迟期肿瘤实质强化。切除标本的组织病理学检查显示有或无玻璃样变性的薄壁、扩张的异常血管。当 MRI 显示颅外头颈部肿瘤的“流空”征时，应考虑 schwannoma。
