Would mri detect cns leak?

Sometimes focal: Magnetic resonance imaging historically less effective at directly imaging sites of CSF leak. Using heavily t2-weighted mr myelography. Has been effective in identifying sites of a CSF leak without the need for a ct scan, lumbar puncture, and contrast and at locating fluid collections such as CSF pooling. Ct myelographywith lumbar puncture most common method. Radionuclide cisternography also used.

Yes: Both MRI and ct scan (with contrast) can detect leak.

Yes: Yes if the correct MRI was ordered, ct can also be used. Usually if a CNS leak is suspected the fluid is first tested before ordering imaging tests.