Visualization of atrial myocardium with Tl-201: case report

A case of right atrial visualization on Tl-201 imaging in a patient with marked right atrial enlargement secondary to atrial septal defect is described. The misinterpretation of Tl-201 an gated cardiac studies on initial inspection, due to this unusual finding, and the importance of obtaining special lateral and oblique view for correct identification of cardiac chambers are discussed.