This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
Which of the following lesion is hyperdense on CT? 
Select and explain. 
A. Ependymoma, B. Medulloblastoma, C. Oligodendroglioma, D. Astrocytoma
B: Medulloblastoma
Answer: B: Medulloblastoma 
Explanation: 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 s/o Medulloblastoma.