Internally Peer Reviewed Renal artery variations including their number, source, and course are very common. So-called accessory arteries arising above the usual trunk is more frequent than one arising below.
Supernumerary vessels are more frequent on the left side than the right.
It is not only ludicrous but dangerous to suggest that the kidneys each receive only a single artery. This is commonly stated and shown in illustrations in textbooks of anatomy used by professional students of medicine and the allied health sciences. The details follow. The right and left renal arteries may arise from the aorta by a common stem. They may arise from the aorta at a lower point than usual, in which case the kidneys lie below their usual position.