Day 1	Admission with progressive coronavirus disease 2019 (COVID-19) pneumonia and type 1 respiratory failure, requiring non-invasive ventilation.
Day 4	Transferred to another hospital for extra-corporeal membrane oxygenation (ECMO). Computed tomography with pulmonary angiography showed pulmonary embolism. Un-enhanced echocardiography showed RV strain. Therapeutic dose of anticoagulation therapy was started.
Day 20	Decannulated from ECMO.
Day 30	Transferred back to our hospital for rehabilitation.
Day 40	Echocardiography was requested due to noted persistent tachycardia, which showed a persistently dilated and dysfunctional right ventricular (RV) with a probable RV mass. Contrast echocardiography showed an avascular mass, likely to be thrombus in this clinical scenario. Anticoagulation therapy was continued extending to 6 months with reassessment of the RV mass by echocardiography after his discharge.
Day 58	Patient continued to improve and discharged.
Day 155	A follow-up echocardiography was done: RV radial function normalized (fractional area change (FAC) = 38%), normal RV longitudinal systolic function, Apart from RV trabeculae, no mass or thrombi could be seen and confirmed by low MI contrast enhancement.