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. 2020 Nov 28;10:77. doi: 10.25259/JCIS_187_2020

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© 2020 Published by Scientific Scholar on behalf of Journal of Clinical Imaging Science

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Figure 13: — Example of “flow gap” in a 70-year-old patient imaged before resection a right frontal meningioma. Time-of-flight magnetic resonance venography (TOF-MRV) image (a) (coronal acquisition) shows signal loss within the proximal left transverse sinus (arrow). Flow signal distally is preserved. Axial maximum intensity projection image of the contrast-enhanced magnetization prepared rapid gradient echo (MPRAGE) (b) confirms hypoplasia of the transverse sinus with adequate luminal enhancement throughout the sinus (arrow). The loss of signal on the TOF-MRV is, therefore, confirmed to be a “flow gap.”