Right ventricular injection study in a cat with tetralogy of Fallot. Note the passage of contrast material from the right ventricle (RV) into the left ventricle (LV) through the ventricular septal defect (arrow).

Continued right ventricular injection study in a cat with tetralogy of Fallot. Note the right ventricular hypertrophy (RVH), simultaneous opacification of the overriding aorta (A) and post-stenotic dilation of the pulmonary trunk (PT).