If ultrasound reveals that the fetus has right subclavian artery fasciculation, further investigation is needed. If the right subclavian artery is isolated, the fetus can be wanted and the pregnancy can continue. However, if the fetus is combined with severe cardiac anomalies or severe malformations of other organs, then the fetus cannot be wanted and the pregnancy needs to be terminated promptly. Vagal subclavian artery refers to the variation of the arterial route of the fetus. During normal development, the right subclavian artery needs to merge with the right common carotid artery. However, in some cases, the right subclavian artery does not fuse with the right common carotid artery during fetal development, resulting in the formation of a vagus of the right subclavian artery, which requires further examination.