<prompt> Which of the congenital cardiac anomaly give rise to characteristic snowman appearance on chest x-ray?Fallots tetralogyTAPVCTGAEbsteins anomaly  <response>: With the unobstructed types of total anomalous pulmonary venous connection TAPVC, the hea is enlarged with increased pulmonary flow. Pulmonary edema is uncommon. In patients with return to the left innominate vein, there may be a characteristic bulging of the superior mediastinum bilaterally, producing a snowman, or figure-eight, contour. With obstructed types, the hea size is nearly normal; there is very marked pulmonary edema, which may give a granular appearance to the lungs, making differentiation from respiratory distress syndrome difficult in a newborn. Ref: Brown D.W., Fulton D.R. 2011. Chapter 83. Congenital Hea Disease in Children and Adolescents. In V. Fuster, R.A. Walsh, R.A. Harrington Eds, Hursts The Hea, 13e. 