<prompt> Transposition of the great aeries is a cardiac malformation that involves which of the following septa?Aoicopulmonary septumAtrial septumAtrioventricular septumInterventricular septum  <response>: Transposition of great vessels involves the Aoicopulmonary septum due to improper spiraling of AP septum fig;- transposition of great aeries Other AP septum disease:- 1.PTApersistent truncus aeriosus - due to absence of migration of NCC to truncus aeriosus. 2. TOF tetrology of fallot:- due to anterior migration of AP septum. Defect in atrial septum lead to ASD. Defect in interventricular septum lead to VSD. 