Abnormal pulmonary vein morphology Misalignment of the pulmonary veins 2020-10-04T11:50:58Z The term is commonly used to describe a putative abnormal location of pulmonary vein branches adjacent to pulmonary arteries within the same adventitial sheath. However, evidence has been provided that the vessels in question are not pulmonary veins, however represent dilated bronchial veins.