The diagnosis of Guillain-Barré syndrome is determined mainly on the basis of clinical findings and CSF analysis. Most imaging studies are performed to exclude other conditions. However, contrast-enhanced spinal MR imaging can be used as a supplementary diagnostic modality in the diagnosing of Guillain-Barré syndrome and in monitoring response to theraphy.

From the manuscript

Spinal MRI Findings of Guillain-Barré Syndrome

Abstract
Guillain-Barré syndrome is a relatively common, acute, and rapidly progressive, inflammatory demyelinating polyneuropathy. The diagnosis is usually established on the basis of symptoms and signs, aided by cerebrospinal fluid findings and electrophysiologic criteria. Previously, radiologic examinations have been used only to rule out other spinal abnormalities. We report a case of systemic lupus erythematosus associated with Guillain-Barré syndrome with marked enhancement of nerve roots of the conus medullaris and cauda equina on MR imaging. These MR observations may help confirm the diagnosis of Guillain-Barré syndrome.