Status post craniotomy for epidural abscess evacuation, view for residual epidural abscess or subdural abscess Metallic artifact from the patient's braces limits the anterior and inferior aspect of the diffusion-weighted and susceptibility weighted images.Status post frontal craniotomy. New rim-enhancing, diffusion restricting fluid collections along the right posterior falx and superolateral to the right frontal lobe are compatible with subdural abscesses. The largest collection adjacent to the posterior falx just anterior and superior to the torcula measures 1.7 cm in thickness (image 14, series 1301). The extra-axial collection overlying the right frontal lobe measures 1.1 cm in thickness (image 11, series 1401). These collections causes local mass effect on the adjacent brain parenchyma and increased T2/FLAIR signal within the right superior frontal and right occipital white matter, compatible with edema/cerebritis. There is no ventricular extension of these collections and the ventricles are normal in size.Minimal enhancement anterior to the right frontal lobe is likely postsurgical and no residual abscess is seen in this area. Enhancing material within the frontal sinuses likely represents granulation tissue.No intraparenchymal mass lesion is seen. No intraparenchymal areas of diffusion restriction are seen to suggest acute infarction. Major intracranial artery and dural venous sinus flow voids are present without evidence of thrombosis.
New subdural abscesses along the right posterior falx cerebri and overlying the right frontal lobe.