Idiopathic enlargement of the right atrium.
A huge saccular idiopathic dilatation of the right atrium was detected with angiography and echocardiography in a 75 year old man. Cardiac catheterization data were compared with data obtained 4 years earlier. Idiopathic right atrial enlargement is not usually accompanied by tricuspid valve disease, but in this case tricuspid insufficiency did occur over a period of 4 years, possibly as a complication in the late stage of idiopathic right atrial enlargement.
D000368:Aged; D006328:Cardiac Catheterization; D006332:Cardiomegaly / Q000150:complications / Q000175:diagnosis*; D004452:Echocardiography; D006325:Heart Atria; D006801:Humans; D008297:Male; D014262:Tricuspid Valve Insufficiency / Q000209:etiology