RT Journal Article SR Electronic T1 Polyserositis secondary to COVID-19: the diagnostic dilemma JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e243880 DO 10.1136/bcr-2021-243880 VO 14 IS 9 A1 Emily Harris A1 Shilen Shanghavi A1 Tatyana Viner YR 2021 UL http://casereports.bmj.com/content/14/9/e243880.abstract AB COVID-19 is a novel disease often presenting with a cough, fever or a change in smell or taste. Recently, it has been recognised that COVID-19 may result in multisystemic issues and thus cause atypical symptoms, which can cause diagnostic delay, uncertainty and inaccuracy. A 60-year-old woman presented to the hospital with a 2-day history of mid-thoracic discomfort, intermittent rigours, fevers and general malaise, a few weeks after likely COVID-19 infection. She was admitted and treated for community-acquired pneumonia. However, her symptoms recurred despite multiple courses of antibiotics, which prompted further workup. A combination of a pleural and pericardial effusion was identified, leading to a diagnosis of polyserositis, and a COVID-19 antibody test came back positive. Colchicine was effective at resolving her symptoms, leading to further conviction of a probable postviral polyserositis.