Lipomatous hypertrophy of the interatrial septum.
D004562:Electrocardiography; D006338:Heart Neoplasms / Q000473:pathology* / Q000503:physiopathology; D006346:Heart Septum / Q000473:pathology*; D006801:Humans; D008067:Lipoma / Q000473:pathology*; D008297:Male; D008875:Middle Aged