Resumen

MONZON CASTILLO, Eli Pedro  y  TEJADA MARTINEZ, Gabriel. Isolated aberrant right subclavian artery. A case report. Rev. peru. ginecol. obstet. [online]. 2020, vol.66, n.3, 00017. ISSN 2304-5132.  http://dx.doi.org/10.31403/rpgo.v66i2266.

An aberrant right subclavian artery (ARSA) is the most common branch abnormality of the aortic arch. It can be identified by ultrasound scan in 1% of cases. The probability of association with cardiac and/or extracardiac anomalies, as well as chromosomal abnormality, is high. Prevalence of ARSA with Down syndrome is approximately 20%, and this marker may contribute to counseling on Down syndrome during the second trimester and maybe in the first trimester. When ARSA is found, recommendations include a detailed study of the fetal anatomy for other markers of aneuploidy and to obtain a fetal echocardiogram. Invasive studies will be limited to those situations where, in addition to ARSA, other markers or other conditions that increase the risk of Down syndrome are found. However, the finding of an isolated ARSA increases the risk to zero and is considered a normal variant.

Palabras clave : Aberrant right subclavian artery (ARSA); Down syndrome.

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