“Double Chamber” Right Ventricle Due to Prominent Trabeculation

The authors present the case of a patient with an apparent separation of the right ventricle into two chambers as shown by gated blood pool imaging with Tc-99m labeled red blood cells. Two dimensional echocardiography demonstrated a prominent trabecula in the right ventricle that accounted for this appearance. The differential diagnosis for this “double chamber” appearance includes normal anatomical structures such as prominent trabeculae, intracavitary masses (i.e., neoplasms and thrombus), marked right atrial enlargement, pseudoaneurysm formation, and imaging artifacts due to body motion.