Fetal d-Transposition of Great Arteries (TGA)
Case of a transposition of great arteries (TGA) with intact ventricular septum. The aortic orifice is anterior right with respect to the pulmonary orifice with parallel course of the great arteries
Sweep showing the RV and LV, as well as the MPA coming off the LV and dividing into the RPA and the LPA.
In this view, one may appreciate the pulmonary valve which is posterior to the aortic valve. The aorta is coming off the anterior right ventricle.
The aorta and the pulmonary artery are parallel.
Ventricular septum should be interrogated in multiple views by colour using a low velocity filter ("Nyquist") to evaluate for the presence of a ventricular septal defect. Here, there is no evidence of a septal defect. A VSD should never fully reassure regarding the need for post-natal septostomy to ensure adequate mixing.