Tricuspid atresia is a cyanotic congenital cardiac anomaly which is characterised by agenesis of the tricuspid valve and right ventricular inlet. There is almost always an obligatory intra-atrial connection through either an ASD or patent foramen ovale (PFO) in order for circulation to be complete 5. A small VSD is often also present. In a proportion of cases, tricuspid atresia may also be associated with transposition of great arteries (TGA).

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