EP09.49: Identifying right‐sided aortic arch is important step to identify associated congenital heart diseases and chromosomal aberrations

Inclusion of three vessels and trachea view in routine cardiac assessment at 18 - 20 weeks morphology scan improves recognition of right-sided aortic arch or double aortic arch and this should be a trigger point to search for other associated cardiac and genetic abnormalities. The databases of two referral ultrasound centres was reviewed retrospectively to identify all routine fetal morphology scans performed at 18–22 weeks gestation between January 2020 and December 2022. A review with postnatal charts where ever available was conducted to confirm findings at birth, neonatal complications or anatomical findings at neonatal echocardiographic or any surgical procedure. Parents of older infants were contacted to assess their wellbeing and to identify any respiratory or feeding difficulties. 6810 routine anomaly scans were performed. Three cases of RAA were identified, a prevalence of 0.05%. One was a case of RAA with left-sided arterial duct, other had a right-sided duct. One was a case of double aortic arch. Postnatal follow-up data were obtained in all cases. The prevalence of a symptomatic vascular ring due to a double aortic arch was one. One case was diagnosed with DiGeorge syndrome and one with TOF. RAA can be easily identified on a fetal anomaly scan, The prevalence of RAA is low in an unselected population. All such cases where RAA is diagnosed should be referred for detailed fetal echocardiography and genetic evaluation. Such parents should be counselled regarding association with gene disorders such as DiGeorge syndrome and the symptoms associated with a vascular ring. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.