title: Anterior dural ectasia mimicking a lytic lesion in the posterior vertebral body in ankylosing spondylitis.
abstract: Anterior 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.
authors.affiliation: Department of Imaging Sciences and Interventional Radiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, India.
authors.forename: Keerthiraj
authors.initials: K
authors.lastname: Bele
authors.forename: Hima Shriniwas
authors.initials: HS
authors.lastname: Pendharkar
authors.forename: Easwer
authors.initials: E
authors.lastname: Venkat
authors.forename: Arun Kumar
authors.initials: AK
authors.lastname: Gupta
mesh_terms: D003937:Diagnosis, Differential; D004108:Dilatation, Pathologic / Q000000981:diagnostic imaging / Q000209:etiology; D004388:Dura Mater / Q000000981:diagnostic imaging*; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011128:Polyradiculopathy / Q000000981:diagnostic imaging* / Q000209:etiology*; D013167:Spondylitis, Ankylosing / Q000150:complications* / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed