transposition of the great arteries

synonym: transposition of the great vessels
https://doi.org/10.1351/goldbook.11315

Congenital cardiovascular malformation in which the position of the chief blood vessels of the heart (aorta and pulmonary artery) is reversed.

Note: Survival then depends on a crossflow of blood between the right and left sides of the heart, as through a ventricular septal defect.
See also: conal growth hypothesis
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 814 (https://doi.org/10.1515/pac-2015-1202)