Posterior fossa epidermoid resection. There are postoperative findings related to posterior fossa epidermoid cyst resection. There are residual punctate foci of somewhat restricted diffusion and high T2 signal along the left lateral aspect of the resection cavity, along the medial margin of the left cerebellar hemisphere and left inferior cerebellar peduncle. There is also a small area of high T2 signal in the posterior medulla. There are also several scattered foci of high T2 signal in the cerebral white matter bilaterally. 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, skull, paranasal sinuses, and scalp soft tissues are unchanged.
Postoperative findings related to posterior fossa epidermoid cyst resection with residual punctate foci of somewhat restricted diffusion and high T2 signal along the left lateral aspect of the resection cavity, along the medial margin of the left cerebellar hemisphere and left inferior cerebellar peduncle, which may represent post-treatment effects or perhaps a small amount of residual epidermoid components. A small area of high T2 signal in the posterior medulla may represent prior injury related to involvement by epidermoid and/or its resection. 