Invasive study is not indicated in our patient who has primary hypertension. Angiography may be extremely helpful when certain secondary causes and complications of hypertension are suspected.

This is a still-frame of an aortogram from another patient with hypertension performed in the right anterior oblique view (RAO). Note the arrow identified by the arrow. The real-time study follows.
Choose the best description of the area identified by the arrow in the aortogram: