MRI and CT scan are similar, but they belong to the same level of imaging, except that they have different principles, different indications and different focus. Enhanced CT is a higher level of examination, and it is based on the plain CT, which is an intravenous injection of contrast for the patient to determine the nature of the lesion. The usual order of examination is that the patient chooses MRI scan or CT scan for examination, and if the patient is found to have an occupying lesion and needs to further clarify the diagnosis, the patient needs to undergo enhancement CT again, or if the patient is suspected to have an occupying lesion based on clinical symptoms and laboratory indicators, but the MRI scan and CT scan do not reveal any abnormality, further enhancement CT can also be done to clarify whether If the patient is suspected of having an occupying lesion based on clinical symptoms and laboratory indications, but the MRI scan and CT scan do not reveal any abnormality, further enhancement CT can be done to clarify whether there is an occupancy.