{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T14:44:05Z","timestamp":1787755445143,"version":"build-2784847793"},"reference-count":21,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JBJS Case Connector"],"published-print":{"date-parts":[[2016,10,26]]},"abstract":"<jats:sec>\n                    <jats:title>Case:<\/jats:title>\n                    <jats:p>A 55-year-old man presented with a history of forefoot pain and swelling. Radiographs revealed a mass with internal calcifications and osseous erosion of the fifth metatarsophalangeal bone. The mass was isointense to muscle on T1-weighted magnetic resonance imaging (MRI) and hyperintense on T2-weighted MRI. A biopsy was performed, and intraoperatively, the lesion appeared as chalky white material, which under polarized light microscopy was composed of weakly positively birefringent rhomboid crystals, leading to a diagnosis of tophaceous pseudogout.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Tophaceus pseudogout should be included in the differential diagnosis of neoplastic-appearing lesions in the foot, and polarized light microscopy should be used when examining biopsy specimens.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2106\/jbjs.cc.16.00050","type":"journal-article","created":{"date-parts":[[2016,11,4]],"date-time":"2016-11-04T09:28:44Z","timestamp":1478251724000},"page":"e86","source":"Crossref","is-referenced-by-count":2,"title":["Atypical Tumoral Presentation of Calcium Pyrophosphate Deposition Disease"],"prefix":"10.2106","volume":"6","author":[{"given":"Ryan","family":"Krochak","sequence":"first","affiliation":[{"name":"Departments of Orthopaedic Surgery (R.K., M.D.C., and H.G.) and Pathology (V.V.), Maimonides Medical Center, Brooklyn, New York"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maya Deza","family":"Culbertson","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery (R.K., M.D.C., and H.G.) and Pathology (V.V.), Maimonides Medical Center, Brooklyn, New York"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vincent","family":"Vigorita","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery (R.K., M.D.C., and H.G.) and Pathology (V.V.), Maimonides Medical Center, Brooklyn, New York"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Howard","family":"Goodman","sequence":"additional","affiliation":[{"name":"Departments of Orthopaedic Surgery (R.K., M.D.C., and H.G.) and Pathology (V.V.), Maimonides Medical Center, Brooklyn, New York"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","reference":[{"issue":"4","key":"bib1-20230821","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1136\/ard.2010.139105","article-title":"European League Against Rheumatism recommendations for calcium pyrophosphate deposition. 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