Figure 2:  .

(A) Obstruction in the systemic venous pathway in a 14 year old after Mustard's operation for transposition. The patch sewn inside the atria to redirect systemic venous return to the mitral valve and left ventricle has become distorted, causing a shelf like obstruction (arrowed). Balloon dilatation has resulted in sufficient widening of the pathway (B) to relieve completely symptoms of venous hypertension (protein losing enteropathy in this case). IVC, inferior vena cava; LV, left ventricle.