If portal vein thrombosis occurs more than one year after and azygoportal disconnection, the patient will orally received 2.5 mg of apixaban (CTTQ, Nanjing, China) twice daily. Then, the efficacy of apixaban in treating portal vein thrombosis will be examined every three months using Doppler ultrasound screening or contrast-enhanced CT scans. If it is effective, the patient will continue to take apixaban.
