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To analyze the sonographic features, associated anomalies and outcome in 104 fetuses with aberrant subclavian artery.
Detailed fetal echocardiography was performed on 3192 pregnancies at a single referral center from January 2014 to November 2016. The three-vessel-trachea (3VT) view was chosen to detect the aberrant subclavian artery, including aberrant right subclavian artery (ARSA) and aberrant left subclavian artery (ALSA). Associated anomalies and perinatal outcome were also evaluated.
Aberrant subclavian artery was detected in 104 out of 3192 fetuses (3.26%). Forty-three cases (41.3%) had aberrant right subclavian artery: in 27 cases (26.0%) it was an isolated aberrant right subclavian artery, and the other 16 cases (15.4%) were accompanied by other cardiac anomalies. Aberrant left subclavian artery was detected in 61 fetuses (58.7%), including 16 cases (15.4%) presented associated cardiac defects, the other 45 cases (43.3%) only had aberrant left subclavian artery with right aortic arch. Of the 72 cases of aberrant subclavian artery, 24 (33.3%) cases underwent termination of pregnancy, 66 (63.5%) resulted in a live birth at term, 6 (5.8%) were lost to follow-up, 9 (8.7%) pregnancies were ongoing.
Aberrant subclavian artery can be prenatally diagnosed by using the three-vessel trachea view. It can be isolated or associated with other fetal anomalies.