Fig. 5

Histological examination revealed dilated and tortuous vessels (single arrow) in the pancreatic subcapsular tissue and parenchyma and surrounding fat tissue (a); these vessels in the lesion that cannot be morphologically differentiated from either arteries or veins (b), numerous arteries have thickened walls, accompanied with severed elastic fibers and various dilated capillaries in the vessel media (single arrow) (c), and dissections were found in outer media of the arteries (single arrow) (d). CBD common bile duct, MPD main pancreatic duct