 There are postoperative findings related to right retrosigmoid craniotomy for resection of an internal auditory canal and cerebellopontine angle mass. There is subjacent unchanged CSF signal intensity extra-axial fluid collection resulting in mild mass effect on the right cerebellar hemisphere as well as the right CN V and VII and VIII. There is a rounded focus of enhancing tissue within the right internal auditory canal that measures approximately 6 x 5 mm, previously 7 x 6 mm. There is also a rind of enhancing tissue along the resection margins in the right cerebellopontine angle that appears slightly thicker anteriorly (3 mm vs. 2 mm on the prior exam) although resolved medially and posteriorly.There is persistent ventriculomegaly that is improved from the prior exam. There is no evidence of acute infarct. There are a few unchanged scattered patchy foci of T2 intensity within the supratentorial white matter are most compatible with mild chronic small vessel ischemic disease. There are no areas of abnormal parenchymal signal. There is no midline shift or herniation. The major cerebral flow voids are intact, although, there are unchanged findings of a right middle cerebral artery bifurcation aneurysm and a left M1 segment aneurysm that are not well assessed on this exam.
1.Postoperative findings related to partial resection of a right vestibular schwannoma with residual intracanalicular and cisternal enhancing presumed tumor that is not significantly changed. 2.Persistent but improved ventriculomegaly.3.Bilateral middle cerebral artery aneurysms that are not well assessed on this exam.