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Case 3: 38-year-old patient with SIHH.
A, Sagittal T2-weighted FSE MR image obtained in the acute phase shows a retrospinal fluid collection that can be identified at the C1–C2 level (short white arrows), a descent of the tonsils (curved black arrow), and subtentorial hygroma (long white arrows).
B, Sagittal T2-weighted FSE image obtained after 4 weeks reveals complete regression of the tonsillar descent (curved black arrow) and of the subtentorial hygroma (straight white arrows).
