An illustrative case of endocardial fibroelastosis and recalcitrant intracardiac thrombosis: a case report

a, arrow: Short axis late gadolinium enhancement images through the right atrium demonstrate thrombus formation measuring 29？×？22 mm three weeks after switch from apixaban to warfarin. b, arrow: The thrombus enlarged to 71？×？21 mm 3？months after continuing use of warfarin. c, arrow: The thrombus diminished to 31？×？5 mm 5？months after discontinuation of warfarin and re-instating apixaba