A case of Budd-Chiari syndrome combined with drainage of the inferior vena cava into the left atrium

Budd-Chiari syndrome is characterized by obstruction of the hepatic venous outflow, which is usually caused by thrombosis or tumours but rarely caused by congenital anomalies of Eustachian valve [1]. Abnormal drainage of the inferior vena cava to the left atrium and Budd-Chiari syndrome are different congenital malformations. The combination of these 2 disorders is very rare. We report a case of a 35-year-old woman with anomalous inferior vena cava drainage into the left atrium resulting in delayed hypoxic symptoms after interventional therapy for Budd-Chiari syndrome 17 years ago. We speculate that an abnormality of the Eustachian valve is the cause of these 2 disorders. After surgical treatment, the patient's oxygen saturation returned to normal.