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transposition

transposition (tranz-po-zish´un)

1. Removal from one place to another; metathesis. 2. The condition of being transposed to the wrong side of the body, as in t. of the viscera, in which the viscera are located opposite their normal position; e.g., the liver on the left, the apex of the heart on the right. 3. Positioning of teeth out of their normal sequence in an arch.
t. of arterial stems t. of the great vessels
corrected t. of the great vessels anatomically or physiologically corrected malposition of the great arteries. In anatomically corrected t., they arise from the correct ventricles but have an abnormal relation to each other (actually a malposition rather than a t.) In physiologically or functionally corrected t., the aorta arises from a systemic ventricle that has the morphologic characteristics of a right ventricle, and the pulmonary artery arises from a "venous" ventricle that has the morphologic characteristics of a left ventricle.
t. of the great vessels congenital malformation in which the aorta arises from the morphologic right ventricle and the pulmonary artery from the morphologic left ventricle resulting in two separate and parallel circulations. The condition is lethal unless some communication exists between the systemic and pulmonic circulation after birth; otherwise, unoxygenated venous blood inappropriately enters the systemic circulation, and oxygenated pulmonary venous blood is inappropriately directed to the pulmonary circulation. The life sustaining communication may be an intra-atrial passage or a patent ductus arteriosus.t. of arterial stems;
penoscrotal t. webbed penis

 

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