Full-endoscopic interlaminar removal of chronic lumbar epidural hematoma after spinal manipulation.

A patient with mild cervical myelopathy due to multilevel ossification of the posterior longitudinal ligament (OPLL) initially underwent a cervical C3-T1 laminectomy with C2-T2 fusion utilizing lateral mass screws. The patient's new postoperative right upper extremity paresis largely resolved within several postoperative months. However, approximately 6 months later, the patient developed increased paraparesis attributed to thoracic OPLL and Ossification of the yellow ligament (OYL) at the T2-T5 and T10-T11 levels. The patient underwent simultaneous minimally invasive (MIS) unilateral MetRx approaches to both regions. Postoperatively, the patient was paraplegic and never recovered function. Multiple mistakes led to permanent paraplegia due to MIS MetRx decompressions for T2-T5 and T10-11 OPLL/OYL in this patient. First, both thoracic procedures should have been performed "open" utilizing a full laminectomy rather than MIS; adequate visualization would have likely averted inadvertent cord injury, and the resultant CSF leak. Second, the surgeon should have used an operating microscope. Third, the operation should have been monitored with somatosensory evoked potentials (SEP), motor evoked potentials (MEP), and EMG (electromyography). Fourth, preoperatively the patient should have received a 1-gram dose of Solumedrol for cord "protection". Fifth, applying Gelfoam as part of the CSF leak repair is contraindicated (e.g. due to swelling in confined spaces- see insert). Sixth, if the patient had not stopped Excedrin prior to the surgery, the surgery should have been delayed to avoid the increased perioperative risk of bleeding/hematoma.