Female, 38 years old, history of right parietal grade 3 oligodendroglioma status post resection, radiation and chemotherapy. Again seen are postsurgical changes of right parietal craniotomy for tumor resection. The resection cavity involving the inferior parietal lobule. There is surrounding T2/FLAIR hyperintensity, which remains unchanged, including signal abnormality extending into the posterior temporal lobe. No new T2/FLAIR hyperintensity, mass effect, or suspicious enhancement is appreciated. Intrinsic T1 hyperintensity and susceptibility effect are again seen and compatible with blood products and/or mineralization.There is a small developmental venous anomaly within the right thalamus. Mild ex vacuo dilatation of the right lateral ventricle is again seen. There is subcentimeter focus of susceptibility within the right paramedian midbrain which is more prominent than prior studies from 9/4/2015 and 3/9/2015. Remainder of the brain parenchyma is unremarkable without evidence of new infarct, hemorrhage, mass, or mass effect. No hydrocephalus. Aside from postsurgical changes, calvarium and extracranial soft tissues are unremarkable.
1. Posttreatment changes in the right temporoparietal lobes remain unchanged. No evidence of tumor progression.2. Gradual increasing size of focus of susceptibility/microhemorrhage within the right paramedian midbrain which may represent a small cavernous malformation, possibly related to prior radiation treatment although unclear if this area was within the radiation field. No surrounding edema.