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Figure 2: (a) A depiction of normal aortic arch anatomy in the Carnegie Stage 16 embryo. The dashed outline indicates the portion, which we propose involutes or never forms in this anomaly (b) A drawing of the proposed anatomy in our case at this stage of development III = 3rd aortic arch, IV = 4th aortic arch, otherwise as in [Figure 1]

Figure 2: (a) A depiction of normal aortic arch anatomy in the Carnegie Stage 16 embryo. The dashed outline indicates the portion, which we propose involutes or never forms in this anomaly (b) A drawing of the proposed anatomy in our case at this stage of development III = 3<sup>rd</sup> aortic arch, IV = 4<sup>th</sup> aortic arch, otherwise as in [Figure 1]