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We present an exceptionally rare case of T-CPPD that was subtle on plain radiography, presenting as a soft tissue mass in the knee joint.<\/jats:p>","DOI":"10.1136\/bcr-2014-203998","type":"journal-article","created":{"date-parts":[[2014,6,10]],"date-time":"2014-06-10T06:14:02Z","timestamp":1402380842000},"page":"bcr2014203998","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":6,"title":["Tophaceous calcium pyrophosphate dihydrate deposition disease of the knee mimicking an aggressive soft tissue tumour"],"prefix":"10.1136","volume":"2014","author":[{"given":"Christopher","family":"Watura","sequence":"first","affiliation":[{"name":"Department of X-ray, Royal National Orthopaedic Hospital NHS Trust, Middlesex, Stanmore, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Asif","family":"Saifuddin","sequence":"additional","affiliation":[{"name":"Department of X-ray, Royal National Orthopaedic Hospital NHS Trust, Middlesex, Stanmore, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2014,6,10]]},"reference":[{"key":"2025082700440213000_2014.jun10_1.bcr2014203998.1","doi-asserted-by":"publisher","DOI":"10.3944\/AOTT.2011.2318"},{"key":"2025082700440213000_2014.jun10_1.bcr2014203998.2","doi-asserted-by":"crossref","unstructured":"Klippel JH . 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