Thoracic and abdominal situs concords, with both heart and stomach on the left side.
US assessment of cardiac anatomy is difficult due to poor acoustic window in this patient.
Cardiac axis looks normal, but heart position is shifted to the left: this situation suggests absence of a left-sided structure or a compressive right-sided structure.
Color Doppler shows on the right side a vessel which could be clearly followed from the umbilical cord, compatible with a portal vein sinus. Suspicion of liver ascension within a normal sized-thorax: right diaphragmatic hernia?