Truncus arteriosus – Cardiology MCQ

Type II truncus arteriosus is:
a) Common pulmonary trunk arises from the truncus arteriosus and divides into left and right pulmonary arteries
b) Two pulmonary arteries arise separately from either side of the truncus
c) Two pulmonary arteries arises separately, but adjacent to each other, from the truncus
d) Pseudo truncus or pulmonary atresia
Correct answer: c) Two pulmonary arteries arises separately, but adjacent to each other, from the truncus
There are three morphological types depending on the origin of pulmonary arteries from the truncus. In type I, a common pulmonary trunk arises from the truncus arteriosus and divides into left and right pulmonary arteries. In type II, the two pulmonary arteries arises separately, but adjacent to each other, from the truncus. In type III, the two pulmonary arteries arise separately from either side of the truncus. The older classification had a type IV as well, which is a pseudotruncus, meaning pulmonary atresia. Another situation is hemitruncus in which one pulmonary artery arises from the aorta. Read more on truncus arteriosus…