The present report describes a rare case of triatrial heart, cor triat
riatum dextrum in a 31-year-old woman in whom the anomaly was incident
ally detected by radionuclide angiocardiography. Subsequent assessment
with two-dimensional echocardiography and right heart catheterization
confirmed the presence of a membrane subdividing the right atrium int
o two distinct chambers. To the best of our knowledge, this is the onl
y case in which this cardiac anomaly was demonstrated by radionuclide
technique.