title: Symptomatic ganglion cyst of ligamentum flavum as a late complication of lumbar fixation.
abstract: We report the case of a 72-year-old man who underwent surgery for a mobile spondylolisthesis L4-L5. Six months later, magnetic resonance imaging revealed an extradural cyst of the ligamentum flavum at L5-S1, which was then removed. Histological examination revealed a ganglion cyst of the ligamentum flavum. Cyst formation could be explained primarily according to the natural history of chronic degenerative disease of spine elements. Nevertheless, we could also consider the cyst formation as demonstrative of an adjacent segment syndrome: hypermobility of the L5-S1 segment just below three fixed vertebral segments would have triggered the mechanical stress necessary for L5-S1 ligamentum flavum degeneration.
authors.affiliation: Department of Medical and Surgical Sciences and Biotechnologies, Polo Pontino Sapienza University of Rome, Italy. massimo.miscusi@uniroma1.it
authors.forename: Massimo
authors.initials: M
authors.lastname: Miscusi
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Petrozza
authors.forename: Filippo M
authors.initials: FM
authors.lastname: Polli
authors.forename: Stefano
authors.initials: S
authors.lastname: Forcato
authors.forename: Carlo D
authors.initials: CD
authors.lastname: Rocca
authors.forename: Antonino
authors.initials: A
authors.lastname: Raco
mesh_terms: D000368:Aged; D045888:Ganglion Cysts / Q000000981:diagnostic imaging* / Q000209:etiology / Q000601:surgery*; D006801:Humans; D017843:Ligamentum Flavum / Q000000981:diagnostic imaging* / Q000601:surgery*; D008159:Lumbar Vertebrae; D008297:Male; D011859:Radiography; D013123:Spinal Fusion / Q000009:adverse effects* / Q000379:methods; D013168:Spondylolisthesis / Q000601:surgery