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FIG 1. Case 2: 50-year-old patient with severe SIHH.
A–F, MR images obtained in the acute phase (A and B), after 6 weeks (C and D), and after 6 months (E and F).
A and B, Sagittal T2-weighted FSE (A) and T1-weighted SE (B) images reveal a retrospinal fluid collection, isointense with CSF, at the C1–C2 level (large arrowheads). The collection extends far into the suboccipital region (small arrowheads, A). A substantial hygroma is located subtentorially (arrows, A).
C and D, Sagittal (C) and axial (D) 3D-CISS images reveal a similar retrospinal fluid collection at the C1–C2 level (arrowheads) and a ventral and dorsal spinal hygroma (arrows, C). The retrospinal fluid collection also extends bilaterally (arrows, D).
E and F, Sagittal (E) and axial (F) 3D-CISS images show the retrospinal fluid collection (arrowhead, E). An additional extradural fluid collection can be seen bilaterally (arrows, F). The superior segment of the ventral spinal hygroma decreased in size (closed arrows, E), and the subtentorial hygroma resolved completely (open arrow, E).
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