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Spondylolisthesis, anterior and posterior disc herniation at L4-L5 level. Note inter-spinous bursal fluid collection at same level (yellow arrows). Note also flattening of the spinous processes; a feature of Baastrup's disease.
Also called kissing spines.
May lead to epidural cyst formation and canal stenosis. Commonly seen with spondylolisthesis. Bursogram is valuable in detecting epidural cysts. Relief of symptoms is by bursal injection of steroids.