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TGA (Transposition of the Great Arteries)
Transposition of the great vessels is characterized by reversed ventricular outflow tracts, with the pulmonary artery arising from the left ventricle and the aorta arising from the right ventricle. The anomaly is often accompanied by a ventricular septal defect. It has a good prognosis because corrective surgery can be performed after birth.

Sonography
With transposition of the great vessels, the pulmonary artery and aorta arise from the base of the heart in parallel, as opposed to the crossed configuration of the normal heart. Because of this, the diagnosis is best made on a long axis of the left ventricle, which demonstrates both great vessels extending cephalad in parallel, the aorta anterior to the pulmonary artery. The four-chamber view is usually normal, unless a ventricular septal defect is present.


A

B


Transposition of the great vessels. A: Oblique view of the heart demonstrates both ventricular outflow tracts arising in parallel, with the pulmonary artery (PA) arising from the left ventricle (LV) and the aorta (AO) arising from the right ventricle (RV). B: The four-chamber view of the heart is normal (RV, right ventricle; LV, left ventricle; RA, right atrium; LA, left atrium).




A

B


Transposition of the great vessels. A: Image of the outflow tracts demonstrates the aorta (AO small arrow) arising from the right ventricle (RV) and the pulmonary artery (PA small arrow) arising from the left ventricle (LV). B: The four-chamber view of the heart is normal (RV small arrow, right ventricle; LV small arrow, left ventricle; RA small arrow, right atrium; LA small arrow, left atrium).






Transposed great vessels arising from the four-chamber heart.
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