Status post fourth ventricular choroid plexus tumor resection. There are postoperative findings related to suboccipital craniotomy with diffuse areas of scalp swelling. There is a residual lobular enhancing mass in the inferior fourth ventricle that measures up to 15 mm. There are patchy areas of high T2 signal and restricted diffusion within the bilateral cerebellar hemispheres. There is a right transfrontal ventricular catheter that terminates in the left lateral ventricle. The ventricles continue to decrease in size, along with the associated periventricular T2 hyperintensity. There is mild high T2 signal in the parenchyma surrounding the catheter. There is no evidence of acute cerebral infarction or intracranial hemorrhage. There is a 6 mm wide arachnoid cyst anterior to the anterior temporal pole. There is a retention cyst in the left maxillary sinus. Scalp fiducial markers are present.
Postoperative findings related to partial resection of a fourth ventricular choroid plexus tumor with patchy areas of acute infarction involving the bilateral cerebellar hemispheres, but essentially resolved ventricular dilatation persistent obstructive hydrocephalus and transependymal edema, with a right transfrontal ventricular shunt catheter in position.