The vagus right subclavian artery is a congenital malformation of the aortic arch. 1. The vagus right subclavian artery is the most common malformation or variant of the aortic arch. Normally, the left aortic arch gives off three branches of the cephalad trunk, which travel from left to right in the upper thoracic cavity, behind the trachea and esophagus, and into the right upper extremity. 2. Vagus right subclavian artery is a change due to the failure of the right subclavian artery and the left carotid artery to converge during embryonic growth and development. It is usually asymptomatic and does not have serious consequences. 3. The vagus right subclavian artery is a benign congenital anomaly that usually has no effect, and only 10% of fetuses may develop localized compression symptoms. 4. After vagus right subclavian artery, if the fetus does not have tracheal compression or impact on respiration, it usually does not need special treatment and daily observation is sufficient. For fetuses with symptoms, it is recommended to go to the hospital for cardiac screening in time to observe whether there are malformations of the heart. If there is a combination of serious cardiac malformations or serious malformations of other organs, it is recommended to go to the hospital in time and receive relevant treatment. If there is a clinical diagnosis of vagus right subclavian artery, it is recommended to go to the hospital in time and get a doctor’s opinion.