 Redemonstration of mixed solid and cystic enhancing mass originating from the midbrain involving the tectum and projecting to the superior vermian cistern. Drainage catheter within the dominant tumoral cyst is unchanged in position. The enhancing portion of the mass similar to prior exam measuring 3.4 x 2.9 cm in axial dimension and 3.3 cm in craniocaudal dimension. The cystic component has increased in size.There is effacement of the quadrigeminal plate cistern and inferior displacement of the fourth ventricle, unchanged from prior. There is superior extension of the mass into the right thalamus. This is some susceptibility associated with the mass perhaps related to blood products.Right frontal approach ventriculostomy catheter with tip terminating in the anterior horn of the right lateral ventricle is unchanged. Ventricular system is mildly dilated but unchanged from prior examination. There is evidence of right frontal craniotomy with some susceptibility changes and a linear tract in the occipital lobe likely postprocedural. Normal flow-voids are demonstrated in the major intracranial vascular structures.
1. Stable size of the solid enhancing component of the mass with interval increase in size of the cystic component.2. Stable mildly dilated ventricular system with right frontal ventriculostomy catheter.