Unusual right-to-left shunt in a patient with tricuspid atresia and stenosis of Fontan conduit

Key Points

• To examine an unusual right-to-left shunt in a patient with tricuspid atresia and Fontan conduit.
• Case report of a patient post-Fontan palliation
• Assessment of venous collaterals
• Oxygen saturation analysis from the renal vein
• Identification of a venous collateral from the renal vein
• High oxygen saturation levels in the renal vein
• Absence of systemic desaturation despite right-to-left shunt