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Ventrodorsal radiograph, normal old cat with aortic "knob"
ventrodorsal-radiograph-normal-old-cat-with-aortic-knob-kittleson-sized
Ventrodorsal radiograph, normal old cat with aortic "knob"

    This VD radiograph shows the aortic knob (arrow) in a normal old cat.

Courtesy of Dr. Mark D. Kittleson.