Figure 2. MRI of DRG and spinal nerve of patients with PHN.

(A) The DRG morphology in lesioned and contralateral side in patients with disease duration ≤3 or >3 months (arrowhead: lesioned side; solid arrow: contralateral side; patient number was showed in each image). (B) The largest cross-sectional area of DRGs were selected (solid arrow), the M value of DRG was measured (green arrow). (C) The largest diameter (hollow arrow) and M value of spinal nerve (green arrow) was measured.