title: An instance of an atypical intraspinal cyst presenting as S1 radiculopathy: a case report and brief review of pathophysiology.
abstract: Intraspinal cysts are rare, but typically they originate from a degenerate zygapophyseal joint. These cysts have been commonly referred to as juxtafacet cysts and occur concomitantly with lumbar and occasionally lower-limb radicular pain. Documented cases have shown pseudoarthroses developing from nonhealing pars defects. Histologic analyses have found synovial tissue within these fibrocartilaginous accumulations. We present a case of S1 radiculopathy indicated by an intraspinal pseudocyst arising as a complication of a chronic spondylolytic defect. A brief review of the related pathophysiology is also included.
authors.affiliation: Department of Physical Medicine and Rehabilitation, The University of Pennsylvania, Philadelphia, PA, USA. depalmamj8@yahoo.com
authors.forename: Michael J
authors.initials: MJ
authors.lastname: DePalma
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Strakowski
authors.forename: Eiran M
authors.initials: EM
authors.lastname: Mandelker
authors.forename: William R
authors.initials: WR
authors.lastname: Zerick
mesh_terms: D000328:Adult; D003560:Cysts / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008159:Lumbar Vertebrae / Q000473:pathology; D008297:Male; D011843:Radiculopathy / Q000175:diagnosis* / Q000209:etiology; D013169:Spondylolysis / Q000150:complications