The tortuous course of the fetal arterial duct may be due to the relatively long and large arterial duct, which generally does not affect the health of the fetus as long as there are no structural or functional developmental abnormalities of the fetal cardiovascular system. The arterial duct is a blood vessel that connects the aorta to the pulmonary artery during fetal life and is generally a normally existing physiological structure. When the duct is too long or too large, tortuosity may occur, but in most cases, as the baby is born, the arterial vascular structure will be normal and close naturally during growth and development. However, if the fetal ductus arteriosus is tortuous and the blood flow at the ductus arteriosus is increased, it is important to consider whether it is caused by constriction of the ductus arteriosus, possibly due to organic disease, such as tricuspid regurgitation, pulmonary atresia, or enlargement of the right atrium or right ventricle. If the fetal ductus arteriosus is tortuous and all other structures are normal, no treatment is needed and a review is indicated. If the fetal arteriovenous ductus arteriosus is combined with other structural abnormalities, it may be due to congenital disease, which is generally untreatable during pregnancy, and if the condition is more serious, you can choose to terminate the pregnancy; if the symptoms are not serious and there is a chance of treatment, you can actively undergo surgery after the birth of the fetus.