Right atrial thrombus leading to pulmonary embolism in a patient with dermatomyositis and COVID-19 managed with FlowTriever device thrombectomy

A woman in her late 40s presented with complaints of shortness of breath, right-sided pleuritic chest pain and diffuse myalgias. She was diagnosed with deep vein thrombosis (DVT) 3 weeks earlier and had been compliant with her oral anticoagulation therapy. Investigations revealed a pulmonary embolism (PE) involving the right distal pulmonary artery on a CT angiogram of the chest. She was also found to have an incidental SARS-CoV-2 (COVID-19) infection and an elevated creatine kinase value. Anticoagulation with intravenous heparin was initiated according to the DVT/PE protocol. The following morning, a medium-sized mobile mass was identified in her right atrium on performing a transthoracic echocardiogram. Due to concerns of embolisation of the mass which could result in obstruction, right ventricular strain and ultimately haemodynamic instability, a thrombectomy was performed using the FlowTriever device under transthoracic echocardiography guidance. The right atrial mass was successfully removed and the patient was transitioned to another oral anticoagulant agent. On discharge, a muscle biopsy was performed and aided in the diagnosis of dermatomyositis and the patient received intravenous Ig, steroids and methotrexate.