Uncommon right ventricular mass: Ectopic thyroid

A 53-year-old woman with complaint of intermittent angina pectoris for 2 years was admitted to our hospital for further evaluation of her cardiac mass. Routine laboratory test results including thyroid function were all normal. Electrocardiography (ECG) showed sinus rhythm with incomplete right bundle branch block. Transthoracic echocardiography indicated a mildly dilated right ventricle with a broad-based mass attached to the interventricular septum (Fig. 1). Non-enhanced computed tomography (CT) showed a spherical mass with a circular opacity measuring 4.8×4.1 cm in the right ventricle, which was supplied by the first major septal branch of the left anterior descending artery; the mass was moderately enhanced on ECG-gated CT scan (Fig. 2a-2d).