Four patients with acute inflammatory polyradiculoneuropathy were eval
uated with MRI. In 3 of 4 cases, gadolinium enhancement was observed i
n the nerve roots of cauda equina, on frontal and horizontal slices. T
his enhancement was correlated with the severity of the clinical pictu
re and the cerebrospinal-fluid inflammatory protein concentration and
supports the inflammatory nature of this forms of acute polyradiculone
uropathy.