PMC4980848_01
Reconstruction of the anatomical variant of azygos vein system identified in this patient: the hemiazygos and accessory hemiazygos veins form common channels which drain into the brachiocephalic vein
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Fig1
We have assumed it was a rare variant of the azygos vein system: the hemiazygos and accessory hemiazygos veins form common channels which drain into the brachiocephalic vein (Fig. 1) (Blackmon and Franco).
The prenatal ultrasound shows a vessel with parallel course on the left and posteriorly to the thoracic aorta
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Fig2
During the investigation it has been identified the presence of a vessel with parallel course, rear and left to thoracic aorta (Fig. 2).
The prenatal ultrasound shows the accessory hemiazygos that drain into the left venous trunk brachial-cephalic
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Fig3
The prenatal ultrasonography with color Doppler has showed a hemiazygos accessory vein that, from the diaphragmatic dome, joining with the superior intercostal vein, seemed to drain into the venous trunk brachial-cephalic left (Fig. 3).
The postnatal echocardiography, through color:Doppler, shows the anterograde flow of blood draining in the left brachiocephalic trunk, as reconstructed in anatomical model in Fig. 1
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Fig4
Postnatal echocardiography has confirmed the presence of a hemiazygos accessory vein that drains into the left brachial-cephalic trunk (Fig. 4).