Transcatheter closure of dilated left superior vena cava for resolution of late cyanosis following fontan palliation.

We report two adolescents with late cyanosis post-Fontan palliation arising from a persistent and dilated left superior vena cava (LSVC) draining into the pulmonary venous circulation. One has undergone successful transcatheter closure of the left superior vena cava while the other is waiting closure. There is a need for long-term follow-up of Fontan patients including adequate clarification of increasing cyanosis which may be correctable.