Pneumocephalus Mimicking Cerebral Cavernous Malformations in MR Susceptibility-Weighted Imaging

A, Axial T2-weighted image shows a right frontotemporal lesion with mixed signal intensity (arrow) suggesting a cavernous malformation. B, SWI confirms the right frontotemporal lesion and also demonstrates several lesions (arrows), all of them extra-axial. C, Axial T2-weighted image at an upper level shows no significant abnormalities except for a small focus of low signal intensity on the left opercular area (arrow). D, SWI demonstrates additional extra-axial foci (arrows), which are not seen on the T2-weighted image.