Cranial CT plain scan can detect skull fracture, intracranial cerebral hemorrhage, massive cerebral infarction, hydrocephalus, brain tumor, meningioma and other diseases, as follows: 1. skull fracture: fracture is very sensitive to cranial CT plain scan, which is the preferred test for diagnosing fracture, and CT is superior to MRI. 2. intracranial cerebral hemorrhage: cerebral hemorrhage is also more sensitive to CT. 3. massive cerebral infarction. 4. hydrocephalus. 5. 2, brain tumor: tumors are generally more obvious and can be seen only in late and mid-late CT, early CT is often less sensitive to tumors. 6, meningioma. 7, other diseases: such as carbon monoxide poisoning, CT can show some lesions.