Fig. 4From: Necrosis of the small intestine leading to a diagnosis of polyarteritis nodosa: a case reportHistopathological findings. a Active vasculitis associated with fibrinoid necrosis was seen in the mesenteric artery (× 20). b Elastica van Gieson staining showed destruction, fibrogenesis, and luminal stenosis of the elastic lamina (× 40)Back to article page