 There is a redemonstration of mildly expansile and infiltrative T1 hypointense and T2 hyperintense lesion within the left pons, midbrain, extending to the left thalamus, with no evidence of enhancement or diffusion restriction, which is unchanged. There is subtle mild extension into the left medial temporal lobe with mild mass effect into the left hippocampus similar to prior. There is minimal questionable FLAIR hyperintensity in the right ventral pons and some expansile convexity which may reflect subtle tumor infiltration. Abnormal T2 signal of the left lateral cerebellar hemisphere is also unchanged. There is postoperative findings within the right cerebellum with focal tissue loss, but no discernible mass lesions. There are several nonspecific punctate foci of susceptibility scattered throughout the brain parenchyma, which are unchanged. There is no evidence of acute ischemia. The ventricles are within normal limits in size and configuration. The major cerebral flow voids are intact. The skull, paranasal sinuses, and scalp soft tissues are grossly unchanged.
1. Compared to 7/16/2015 and 4/17/2015, there is unchanged appearance of the dominant infiltrating mass involving the left pons, midbrain and left thalamus. Additional subtle foci of suspected glial neoplasm including the left lateral cerebellum and right pons are also unchanged.2. Postoperative findings within the right cerebellum. No evidence of tumor progression.