Keywords: گرادیان فشار وریدی کبدی; Fontan surgery; Liver disease; Hepatocellular carcinoma; Fontan failure; CirugÃa de Fontan; Enfermedad hepática; Hepatocarcinoma; Fracaso del Fontan; FALD; Fontan-associated liver disease; FS; Fontan surgery; HVPG; hepatic vein pressure gradient; MELD;