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FIG 3. Case 9: 38-year old patient with SIHH. MR imaging was performed in the acute phase.
A–G, T2-weighted FSE images in the sagittal (A) and axial (D) planes reveal a retrospinal fluid collection (short thick arrow, A; arrowhead, D) and a subtentorial hygroma (thin double arrows, A). The anterior internal vertebral plexus is dilated, and large flow voids can be identified (long thick arrow, A; arrows, D). The flow voids of the dilated anterior internal vertebral plexus can be confirmed on corresponding axial slices obtained with a flow-sensitive 2D FLASH sequence (arrows, E). The dilated anterior internal vertebral plexus can also be identified on T1-weighted SE images in the sagittal (arrow, B) and axial (arrows, F) planes. The dilated anterior internal vertebral plexus is seen even better on contrast-enhanced T1-weighted SE images in the sagittal (arrow, C) and axial (arrows, G) planes.
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