Masson’s trichrome staining for epidural adhesion in the laminectomy sites treated with Sal B (a), Vehicle (b) or nothing (c). a: Loose scar tissues without adherence to the dura mater were seen in the Sal B group. b, c: Dense scar tissues adhered to the dura mater were observed in the Vehicle and Sham groups. The magnification was 100×. SC = spinal cord, D = dura mater, EF = epidural fibrosis, L = laminectomy.