Ankylosing spondylitis; evaluate for disc herniation. There mild disc dessication and loss of height at L4-5 and L5-S1. There is no significant spinal canal or neural stenosis. The vertebral column alignment is within normal limits. The vertebral body are preserved. The vertebral bone marrow signal is unremarkable. The spinal cord displays normal signal and morphology. The paravertebral soft tissues are unremarkable.
Mild disc dessication at L4-5 and L5-S1 without significant spinal canal.