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(a) CT Head non-contrast obtained for chronic headache, originally read as a negative study. In retrospect, there is soft tissue thickening at the left cavernous sinus (white arrow) with possible adjacent hyperostosis and retroclival extension. (b) MRI with contrast 4 years later demonstrated an extra-axial dural based enhancing meningioma involving the left cavernous sinus with extension to the suprasellar cistern and sella (white arrow).
