Rest and stress perfusion images showing inferior wall defect with corresponding coronary x-ray angiography. a. Rest perfusion image demonstrating mid inferior wall defect (white arrow). b. Stress perfusion image demonstrating mid inferior wall defect with septal wall extension (green arrow). c. Coronary X-ray angiography demonstrating chronic total occlusion of the mid right coronary artery (red arrow). d. Coronary X-ray angiography demonstrating distal right coronary artery filling via collaterals (blue arrow).