Absence of which amongst the following is the most common variation

The right colic aery arises from about the middle of the concavity of the superior mesenteric aery, or from a stem common to it and the ileocolic. It passes to the right behind the peritoneum , and in front of the right internal spermatic or ovarian vessels, the right ureter and the psoas major, toward the middle of the ascending colon; sometimes the vessel lies at a higher level, and crosses the descending pa of the duodenum and the lower end of the right kidney. image ref - britannica.com