RT Journal Article SR Electronic T1 Case of knee swelling JF Archives of disease in childhood - Education & practice edition JO Arch Dis Child Educ Pract Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP edpract-2018-316268 DO 10.1136/archdischild-2018-316268 A1 Sarah Williamson A1 Subramanian Mahadevan-Bava YR 2019 UL http://ep.bmj.com/content/early/2019/02/01/archdischild-2018-316268.abstract AB QuestionsWhat does the X-ray show?InfectionPeriarticular soft tissue calcificationArtefactGout What condition is associated with these radiological findings?Tumorous calcinosisSynovial sarcomaChronic renal failureJuvenile dermatomyositisAll of the above What biochemical abnormality is seen in this condition?Low calciumRaised calciumRaised or normal phosphateNone of the above What is the most appropriate treatment?Normalisation of any biochemical abnormalitiesSurgical excisionConservative managementAll of the above Questions Answers can be found on page 2.