CT of the brain can detect cerebellar hemorrhage, cerebral infarction, and brain tumors. However, CT has some limitations when looking at the cerebellum and brainstem, because the bony structure of the posterior cerebral fossa produces some artifacts, and smaller lesions in the brainstem and cerebellum are often not seen clearly, so it is not as accurate as MRI. Since CT is more sensitive to brain hemorrhage, CT has an advantage over MRI in this regard, so we usually do CT first for cerebellar and brain stem lesions to exclude brain hemorrhage, and then we also let patients do MRI of the head to show brain infarction and brain tumor lesions more clearly, but we cannot say that CT cannot investigate cerebellum.