CSF leak, plan for OR. Additional history includes prior right hemispherectomy for epilepsy. Status post right hemispherectomy. A left transoccipital catheter terminates in the right cerebral hemisphere cavity, unchanged. Dysmorphic and collapsed third and left lateral ventricles are unchanged. Periventricular white matter T2 hyperintensity is again seen, and grossly unchanged. A complex cystic collection in the posterior left cerebral hemisphere is unchanged. No evidence of restricted diffusion to suggest acute infarct. Carotid, basilar, and left sided major intracranial flow voids are present indicating patency. The right lenticular shaped extradural collection has decreased in maximal diameter currently measuring 12 mm, previously up to 19 mm, and is now predominantly air-filled. The paranasal sinuses and mastoid air cells are clear.
Postoperative changes of right hemispherectomy with decreasing right extradural fluid collection. 