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Hyperostosis related to a CSF leak. Sagittal T1-weight images before (A) and after (B) the development and diagnosis of SIH, with 16 years between examinations. Multiple classic findings of SIH are seen, including brain sag (dashed oval) and herniation of the cerebellar tonsils through the foramen magnum (dashed arrow). The patient also developed substantial frontal-predominant calvarial hyperostosis (between solid arrows), particularly along the inner table of the skull.
