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Surgery for ossification of the ligamentum flavum (OLF) comes with a relatively high risk of dural tear. We report a 50-year-old woman, who presented with symptomatic spinal stenosis from OLF at T11–T12 and lower lumbar spondylosis for which a single stage posterior decompression and instrumented fusion of both sites was done. Removal of the OLF resulted in a small dural tear with intact arachanoid which was covered using a fibrin sealant. In the first post-operative day, the patient’s neurology started deteriorating. An MR scan was done to look for hematoma. It showed the spinal cord herniating out of the thecal sac at the operated level. Emergency re-operation was done to reduce the herniation and the dural defect was repaired. The patient gradually recovered to her best functional status. Based on this experience, we advise primary repair of inadvertent durotomies.

Post-surgical thoracic spinal cord herniation following an unrepaired dural defect: a rare complication