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FIG 4. Image reveals arachnoid granulation in a 55-year-old woman with seizures who had normal results of an MR imaging study. Sagittal reconstruction image obtained with a 3D contrast-enhanced MPRAGE sequence shows a large CSF-isointense pouchlike focal filling defect (arrowheads) in the straight sinus. Note that this structure extends to the adjacent CSF space (asterisk) via the orifice opening to the subarachnoid space (small arrows).
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