title: Floating Tophi in a Baker Cyst Secondary to Gout: Ultrasound Features and Differential Diagnosis.
abstract: We report the case of a 36-year-old man with a recent diagnosis of gout, who presents with a fullness behind his right knee that fluctuates in size with time. An ultrasound revealed a Baker cyst that contained both large and punctate internal hyperechoic foci. Cyst aspiration revealed negatively birefringent crystals, which were consistent with gout.
authors.affiliation: *Musculoskeletal Imaging Section, Department of Radiology, and †Division of Rheumatology, Department of Medicine, University of California, Los Angeles, Los Angeles, CA.
authors.forename: William
authors.initials: W
authors.lastname: Derry
authors.forename: Kambiz
authors.initials: K
authors.lastname: Motamedi
authors.forename: Ami
authors.initials: A
authors.lastname: Ben-Artzi
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D006073:Gout / Q000150:complications* / Q000000981:diagnostic imaging; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging; D008297:Male; D011151:Popliteal Cyst / Q000000981:diagnostic imaging* / Q000209:etiology*; D014463:Ultrasonography