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Example of layered calvarial thickening in a patient with SIH. Sagittal MR images (A) demonstrate classic findings of SIH, including pituitary enlargement, brain sag, and dural venous sinus engorgement. Axial CT image (B) in the same patient shows thickening of the bifrontal calvaria with characteristic layering related to preferential growth along the inner table of the skull (between straight arrows).
