[[Developmental spondylolisthesis]] is further divided into two types, both with lysis and elongation: low dysplastic and high dysplastic, depending on the severity of the bony dysplastic changes present on the L5 and S1 vertebrae and on the risk of slip progression.
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Succesful management of a giant [[anterior sacral meningocele]] associated with [[low-dysplastic spondylolisthesis]] from single posterior approach: case report
((Vanek P, Benes V. Succesful management of a giant anterior sacral meningocele 
associated with low-dysplastic spondylolisthesis from single posterior approach: 
case report. World Neurosurg. 2019 Apr 19. pii: S1878-8750(19)31099-X. doi:
10.1016/j.wneu.2019.04.105. [Epub ahead of print] PubMed PMID: 31009790.
)).