Evaluate ventricle size. Hydrocephalus. There is a large infratentorial cystic mass posterior and superior to the cerebellar hemispheres causing mass effect on the cerebellum and the frontal lobes. The fourth ventricle is enlarged with altered configuration. The lateral and third ventricles appear normal in size. An MRI is recommended for further evaluation.There is no evidence of intracranial hemorrhage. There are questionable foci of hypodensity in the left cerebellar hemisphere of unclear clinical significance.A shunt catheter traverses the right parietal bone and with its tip located in the large cystic infratentorial mass.The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
Large cystic mass posterior and superior to the cerebellar hemispheres causing mass effect with enlargement of the fourth ventricle. Shunt catheter tip is within the cystic mass. An MRI is recommended for further evaluation.