Right ventricular injection study in a dog with valvular and subvalvular pulmonic stenosis (PS), non-compaction of the myocardium and single coronary artery. Note marked right ventricular hypertrophy (RVH), subvalvular stenosis (arrow) and post-stenotic dilation of the pulmonary trunk (PT).

Continued right ventricular injection study in the same dog. Note contrast material distribution throughout the myocardium indicating non-compaction (NC) of the right ventricular free wall.

Left ventricular injection study in the same dog showing a single coronary artery (SCA). The paraconal (Pc) and left circumflex (LCx) coronary arteries originate from the right coronary sinus along with the right coronary artery. The LCx is juxtaposed over the aortic sinuses of Valsalva similar to an R2A pattern but it does not constrict the pulmonary valve area thus it must be an R2B distribution in which the LCx courses between the aorta and the pulmonary trunk.

Left ventricular injection study in the same dog showing non-compaction (NC) of the left ventricular wall.