Cerebrospinal fluid
Cerebrospinal fluid leaks are diagnosed by performing different tests. A diagnostic dural puncture is commonly used because its results show the presence of a leak easily. Other types of tests that could be used are cranial CT, cranial MRI, spinal MRI, and CT myelography. A cranial MRI can be diagnostic by showing one of the five main findings, which are subdural fluid collections, enhancement of venous structures, pituitary hyperemia, and sagging of the brain.