Pulmonary plethora in a child presenting with cynosis, is seen in?

Pulmonary plethorais a term used to describe the appearances of increased pulmonary perfusion on Chest radiographs Usually a left-to-right shunt of 2:1 is required for pulmonary plethora to occur. Increased pulmonary perfusion occurs in a number of situations: Left-to-right cardiac shunts, e.g. ASD, VSD, PDA Paial or total anomalous pulmonary venous connections Transposition of the great aeries Truncus aeriosus Vein of Galen malformation It may also been seen in healthy patients with increased cardiac output (e.g. pregnancy). Pulmonary plethora can occur with or without cyanosis with different causes attributed: without cyanosis:left-to-right shunt with cyanosis:transposition of great aeries, TAPVC, Truncus aeriosus