Right atrial myxoma.
D000790:Angiocardiography; D006328:Cardiac Catheterization; D006348:Cardiac Surgical Procedures; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006338:Heart Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006349:Heart Valve Diseases / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009232:Myxoma / Q000175:diagnosis*