<prompt> Which of the following lesion is hyperdense on CT?EpendymomaMedulloblastomaOligodendrogliomaAstrocytoma  <response>: Most Brain tumors are Hypodense on NCCT Hyperdense Brain tumors include Medulloblastoma, CNS Lymphoma, and Pineal Germinomas. NCCT showing a hyperdense lesion in 4th ventricle so Medulloblastoma. 