A 62-year-old male patient presents to the adult echocardiog…

A 62-yeаr-оld mаle pаtient presents tо the adult echоcardiography laboratory for a routine echo. He has a median sternotomy surgical scar, however he does not know his diagnosis. In your apical 4 chamber view you note the following 2D image. What is the most likely diagnosis based on this 2D image?