 There are unchanged postoperative findings related to left parietal craniotomy for resection of a left frontal lobe mass with associated susceptibility effect in and adjacent to the resection cavity compatible with chronic blood products. Additional small scattered areas of susceptibility artifact, for example in the left frontal lobe, may be related to development of cavernous malformation from prior radiation treatment. Since current exam was performed in 3T MRI, those lesions appear to be more conspicuous than prior exam performed in 1.5T on Mar 2016. Considering the difference in magnet strength, there is no significant interval difference in terms of numbers and distribution. There is a persistent extra-axial fluid collection subjacent to the craniotomy flap. There is unchanged confluent T2 hyperintensity without associated mass effect within the left frontal white matter, in the region of the treatment bed. However, there is no enhancement in the region of the resection cavity. There is no evidence of acute infarct likely related to gliosis. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits and paranasal sinuses are unremarkable.
1. MRI of the brain with and without contrast is negative for tumor progression. 2. A few scattered areas of gradient susceptibility may be related to chronic hemosiderin deposition versus developing cavernous malformations from prior radiation treatment, unchanged since prior scan considering the difference in examining magnet strength.