Table 2 Magnetic resonance neurography imaging findings of peripheral nerves [1]

Size

Like neighboring artery and declines distally

Focal or diffuse swelling, greater than neighboring arteries

Signal intensity

Both T1 and T2 -weighted imaging are isointense to skeletal muscle

T2-weighted imaging is hyperintense like neighboring veins

Fascicular structure

Maintained on T1 and T2 -weighted imaging

fascicular swelling, blurring or distortion

Course

Smooth delineated by fat with no focal deviation

discontinuity or deviation whether focal or diffuse

Enhancement

Absent except for posterior root ganglion or blood-nerve barrier deficiency

Existing in tumor, infection, inflammation due to interruption of blood-nerve barrier

Perineural fat Planes

Maintained and clean

Effaced