History of recurrent low grade astrocytoma s/p craniotomy and chemotherapy. There has been interval decrease in size of the predominantly enhancing lobular mass with peripheral cystic components centered in the hypothalamic region, now measuring up to 57 mm in the sagittal plane, previously 60 mm. There are punctate scattered foci of susceptibility effect in the tumor. The mass encases and displaces portions of the bilateral internal carotid, middle cerebral, and anterior cerebral arteries. There is persistent prominence of the lateral ventricles and partial effacement of the third ventricle. There is encephalomalacia in the anterolateral right frontal lobe, which may be related to right frontal craniotomy for tumor biopsy. There is no evidence of acute infarction.
Interval decrease in size of the hypothalamic region astrocytoma.