Histology of the portal-inferior vena cava shunt.

<p><b>A</b>, The two magnets stably matched and a large number of fibrous connective tissue can be observed around the anastomosis. <b>B</b>, Mild intimal hyperplasia in the portal vein and the inferior vena cava (H&E staining, 40×). <b>C</b>, Continuity of the vascular adventitia from the portal vein to the inferior vena cava (H&E staining, 40×). <b>D</b>, 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.</p>