Spinal subdural hematoma after interlaminar full-endoscopic decompression of lumbar spinal stenosis: a case report and literature review.

The use of full-endoscopic decompression for lumbar spinal stenosis has been increasing recently. It is a minimally invasive surgical procedure that has few complications. Spinal subdural hematoma (SSH) following endoscopic surgery has never been reported. Previously described SSHs have occurred spontaneously or due to surgery-related iatrogenic injury. We describe the first case of SSH after endoscopic decompression. A 68-year-old woman presented with bilateral radiating pain and neurological claudication due to lumbar spinal stenosis at the L4-5 level. Full-endoscopic interlaminar decompression was performed without intraoperative complications. Preoperative leg pain improved after endoscopic decompression. However, two days after the index surgery, the patient complained of severe radiating pain in her right leg with urinary retention. The radiologic evaluation showed compressive subdural fluid collection at the index level. Open microscopic decompression was performed. No dural injury was observed. After durotomy, xanthochromic fluid gushed out at a high pressure. We found that the arachnoid was also intact. The patient recovered completely after surgical hematoma evacuation. Although SSH after endoscopic decompression is a very rare event, it is a reminder that suspicion and urgent imaging and intervention are necessary during the postoperative period upon development of unexpected, progressive neurological deterioration regardless of intraoperative problems. Additionally, early surgical decompression is necessary for optimal neurological recovery.