“…On the other hand, in type 2 patients, there is a possibility that a patient can enjoy a favorable life without any consequences by a simple shunt occlusion. Uchino, et al identified 51 cases of congenital portosystemic shunt in Japan ; 34 of the intrahepatic type and 17 of the extrahepatic type, of which spontaneous closure was occurred only in the intrahepatic type, but not in the extrahepatic type (17). If patients with CEPS are left untreated, they will sustain various consequences such as repeated encephalopathy (7,18), neurocognitive dysfunction (14), pulmonary hypertension (19), hepatopulmonary syndrome (9), cataract (3), liver atrophy (16), liver tumors (10,14) and so on.…”