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Truncus arteriosus

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truncus arteriosus

(Science: radiology) right aortic arch (30-50%), vSD always immediately beneaath common truncal valve, waterfall or hilar comma sign (types II and III) TYPE, I short main pulmonary artery arises from left post-lat aspect, II pulmonary arteries arise separately from left post-lat aspect, III each pulmonary artery arises from lateral aspects, iV pulmonary arteries arise from dorsal aorta (pseudotruncus), probably tetralogy of Fallot with pulmonary atresia