Interval tumor resection (central neurocytoma). There has been interval right frontal craniotomy with scattered areas of pneumocephalus and right frontal lobe leptomeningeal enhancement and vasogenic edema, as well as diffuse areas of scalp swelling. There is residual tumor within the body of the right lateral ventricle with areas of high and intermediate T1 signal and susceptibility effect. Overall, the residual tumor measures approximately 15 x 30 mm in axial cross-section. There is persistent susceptibility effect and high T1 signal in the glomus of the right lateral ventricle choroid plexus with high T1 signal, as well as a small amount of layering susceptibility effect in the right lateral ventricle with intermediate T1 signal. There are two right transfrontal ventricular catheters in unchanged positions. There is persistent dilatation of the right lateral ventricle posterior to the mass, with deviation of the septum pellucidum 15 mm to the left. The rest of the ventricular system is not dilated. There is a mild degree of vasogenic edema and susceptibility effect related to hemorrhage in the left frontal lobe along the paths of the catheters. There is no evidence of acute territorial infarct. The major cerebral flow voids are intact.
1. Postoperative findings related to partial resection of a right lateral ventricle central neurocytoma with acute upon subacute intratumor hemorrhage, as well as subacute hemorrhage in the glomus of the right lateral ventricle and acute hemorrhage layering in the right lateral ventricle. 2. Persistent dilatation of the right lateral ventricle posterior to the mass due to obstructive hydrocephalus. The rest of the catheterized ventricular system is not dilatated.