pseudotruncus arteriosus

Congenital cardiovascular malformation with atresia of the pulmonic valve and absence of the main pulmonary artery; the lungs are supplied with blood either through a patent ductus or via bronchial arteries arising from the aorta; a characteristic of the most severe form of tetralogy of Fallot.

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pseu·do·trun·cus ar·te·ri·o·sus (soo″do-trungґkəs ahr-tēr″e-oґsəs) the most severe form of tetralogy of Fallot, accompanied by pulmonary atresia in which outflow is through a single major vessel, the aorta, accompanied by the remnant of the atretic pulmonary artery.