Bele, KeerthirajPendharkar, Hima ShriniwasVenkat, EaswerGupta, Arun Kumar2012-12-042012-12-042011JOURNAL OF NEUROSURGERY-SPINE. 15; 6; 636-640http://dx.doi.org/10.3171/2011.8.SPINE1142https://dspace.sctimst.ac.in/handle/123456789/132Anterior dural ectasia is an extremely rare finding in ankylosing spondylitis (AS). The authors describe a unique case of AS in which the patient presented with cauda equina syndrome as well as an unusual imaging finding of erosion of the posterior aspect of the L-1 (predominantly) and L-2 vertebral bodies due to anterior dural ectasia. Symptomatic patients with long-standing AS should be monitored for the presence of dural ectasia, which can be anterior in location, as is demonstrated in the present case. (DOI: 10.3171/2011.8.SPINE1142)Neurology