<prompt> Which does not form the border of heart in PA view of a chest X-ray?Right atriumRight ventricleAortic archLeft Ventricle  <response>: Ans- B Ref: Nelsons Textbook of Pediatrics 18th edition: page no 1865 Explanation: In a CXR PA view the Left border of Heart is formed by: A.M.L Aortic arch Main pulmonary artery Left pulmonary artery, Left atrial appendage, Left ventricle Right border of Heart is formed by: S.I.R SVC IVC Right Atrium Abnormal cardiac silhouettes Boot-shaped heart seen in cyanotic tetralogy of Fallot Egg-shaped heart seen in transposition of the great arteries. Snowman sign or Figure of 8 appearance seen in total anomalous pulmonary venous return supracardiac TAPVC 