The epidurolysis is endoscopy of the epidural space. This is a visualization technique in the diagnosis and treatment of back pain syndromes. It can be performed using a flexible and steerable endoscope, and a flexible catheter epiduroscope. The endoscope is inserted through the sacral hiatus is a hole in the bottom of the sacrum. This treatment is indicated for the treatment of secondary sciatic and lumbar pain, in cases of epidural fibrosis around the nerve root, when there is pain in the legs and slipped disc.