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MSDMERCK MANUALVeterinary Manual
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Ventrodorsal radiograph, normal old cat with aortic "knob"
Ventrodorsal radiograph, normal old cat with aortic "knob"
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.