How is arachnoiditis diagnosed?

Difficulty in diagnosing arachnoiditis has been compounded by a lack of awareness about the problem. Diagnosing arachnoiditis can be difficult, but tests such as a CT scan (computerized tomography) or MRI (magnetic resonance imaging) have helped with diagnosis. A test called an electromyogram (EMG) can assess the severity of the ongoing damage to affected nerve roots by using electrical impulses to check nerve function.

Myelograms with the radiographic contrast currently in use, combined with CT scanning, are not considered to be responsible for causing arachnoiditis or causing it to worsen.