Describe an example situation in which a doctor would order an MRI of a patient's head.

The doctor could suspect the patient has a tumor, cyst, aneurysm,etc. Or the patient could have had a stroke and they want to figure out why they had a stroke. There's a lot of other reasons also those are just the ones that came to my head. 

Head MRIs can be used to identify tumors, brain damage, blood flow, multiple sclerosis, and other conditions.