Normal Postoperative Change: Epidural Space

KEY FACTS

Terminology

• Peridural fibrosis

  • Some degree of peridural fibrosis along margin of thecal sac is typical finding following discectomy

  • Edema and tissue disruption at discectomy site particularly conspicuous in first 6 weeks postoperatively

  • Can simulate disc residual/recurrent disc herniation

  • Scarring has been implicated with nerve root irritation in failed back surgery syndrome

• Postoperative fluid collection

  • Fluid collection in operative bed is not uncommon in immediate postoperative setting

  • May have complex signal

  • May have fluid-fluid levels

  • May demonstrate peripheral enhancement