[Cystic lesion and compression of the posterior epidural space associated with bilateral lumbar spondylolysis. Presentation of a case. Correlation with observable arthrographic images in a case of spondylolysis].

The authors report a compressive cystic lesion of the central lumbar retrodural space, which was related to a bilateral L5 spondylolysis. Correlation is made with the contralateral opacification of the facet joints sometimes observed during contrast injection of these joints. Pathways and possible causes are discussed.