2 | CASE REPORT
Case 1: A 32-year-old pregnant woman, gravida 2, para 1, was diagnosed by prenatal fetal echocardiography at 25+1 weeks of gestation. An “U”-shaped VR can be seen with RAA, aberrant left subclavian artery (LSA) and left-sided ductus arteriosus (DA) in three-vessel trachea view (Fig 1A). Color blood flow can show the “U”-shaped VR and aberrant left subclavian artery(ALSA) (Fig 1B). Four-dimensional(4D) color Doppler ultrasound ,HD-flow render mode and STIC were used to show VR and ALSA(Fig 1C) . Two-dimensional(2D )ultrasound could demonstrat the ALSA in descending aorta long axis view (Fig 1D). Color blood flow demonstrating the ALSA (Fig 1E). The imaging of RAA and ALSA were shown with HD-flow render mode and STIC(Fig 1F). Amniocenntesis showed no chromosomal abnormality. A male infant was delivered by vaginal delivery with a birth weight of 3610 kg at 39+5 weeks of gestation and he has no signs of tracheal and esophageal compression.
Case 2:A 21-year-old pregnant woman,gravida 1, para 0, underwent fetal echocardiography examination at 23+5 weeks’ gestation due to DAA diagnosed at other hospital by system ultrasound. 2D ultrasound showed an “U”-shaped VR with RAA and left-sided DA by three-vessel trachea(3VT) view (Fig. 2A). Color blood flow could show the “U”-shaped VR and left innocent artery(LINA) (Fig 2B). 4D color Doppler ultrasound ,HD-flow render mode and STIC were used to show VR and LINA (Fig 1C). A female infant was delivered by cesarean section with a birth weight of 3920 kg at 40+2 weeks of gestation. The newborn did not show signs of tracheal and esophageal compression also.
Case 3: A 36-year-old maternity, gravida 2, para 1,was performed fetal echocardiography examination at 28 weeks’ gestation due to senior pregnant women. RAA with mirror branch was diagnosed. A review of the fetal echocardiogram revealed that the vascular ring was a DAA two weeks later(Figure 3A,3B,3C). A cesarean section was performed at 39+1 weeks with the request of the maternity. A male infant weighing 3250g was delivered. The infant present ed of airway obstruction in the first year of birth and computed tomography angiography was performed postpartum, the DAA could be seen (Figure 3D). The child underwent cardiac surgery at the age of one.The left aortic arch was blocked because of the advantage of the right arch and the prognosis was good.