With a pooled prevalence of 47.1% (95%CI:36.0–55.5), the retrocaval course of the SANa was the most common course of the artery, followed by the precaval and pericaval courses with a pooled prevalence of 38.9% (95%CI:28.5–47.6) and 14.0% (95%CI:7.5–21.1), respectively.
Source: wiktionary