Reason: history of metastatic thyroid cancer with brain metastases (s/p resection of R occipital lesion followed by radiation therapy) Again seen are postoperative findings related to right occipital craniotomy. Given differences in technique and motion degradation, there is no significant change in dural thickening along the posterior falx cerebri and parenchymal enhancement within the right paramedian occipital lobe resection cavity. There is no significant change in confluent T2 hyperintensity along the margins of this resection cavity. No new abnormal intracranial enhancement is identified. There is an unchanged background of nonspecific cerebral white matter T2 hyperintensity, which may represent chronic small vessel ischemic disease. There is no evidence of acute intracranial hemorrhage or acute cerebral infarct. 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. There are bilateral lens implants. Unchanged T1 hyperintense focus in the left frontal calvarium without destructive osseous lesions apparent.
Motion degradation limits sensitivity for subcentimeter lesions. There is however no significant change in posttreatment changes in the right occipital region without evidence of new intracranial metastases.