Extradural and subdural abscess, unspecified [G06.2], Reason for Study: ^Reason: Evaluate interval change History: CNS abscess Previously seen right temporo-occipital intra axial hemorrhagic lesions (larger posterior one and relatively smaller anterior one) shows interval decrease in size and decreased extent of surrounding edema since prior scan.The lesion is now more confined with peripheral susceptibility rim indicating hemosiderin deposition.On enhancement, there is somewhat nodular and linear enhancement especially around the smaller and anterior one which the extent of enhancement appears to be much smaller than before.Both larger one and smaller one show restricted diffusion, thus indicating possibility of abscess.Previously seen multifocal nodular intra axial enhancing lesions are now not demonstrated except the one on the posterior aspect of the left superior temporal gyrus which again shows significant reduction in its size.The ventricles, sulci and cisterns are symmetric and unremarkable. The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. Mucosal thickening on all paranasal sinuses indicating possible pansinusitis.Bilateral mastoid air cells show fluid collections.
1. Interval decrease in size and the extent of enhancement (especially smaller anterior one) as well as the extent of surrounding edema of right temporo-occipital hemorrhagic lesions which likely represent abscess.2. Interval regression of multifocal intra axial enhancing lesions and decreased size of left superior temporal gyrus enhancing nodule since prior scan.3. No change of pansinusitis and bilateral mastoid fluid collection since prior scan. 