Histology of the portal-inferior vena cava shunt.

A, The two magnets stably matched and a large number of fibrous connective tissue can be observed around the anastomosis. B, Mild intimal hyperplasia in the portal vein and the inferior vena cava (H&E staining, 40×). C, Continuity of the vascular adventitia from the portal vein to the inferior vena cava (H&E staining, 40×). D, A large quantity of tidily arranged collagen surrounding the adventitia (Masson’s trichrome stain, 40×). Red arrow: continuous fusion between the portal vein and the vascular adventitia of the inferior vena cava.