Fig. 1
From: Complement-mediated microangiopathy in IgA nephropathy and IgA vasculitis with nephritis
Typical examples of active and chronic microangiopathy. Typical example of a renal biopsy with active microangiopathy with thrombosis (a), showing a microthrombus (arrowhead) in an arteriole in the absence of inflammatory changes. Typical example of a renal biopsy with chronic microangiopathy (b), showing an organized thrombus (arrowhead) in the vessel wall with recanalization, and obliteration of the vessel lumen due to intimal hyperplasia. a: silver stain, original maginifcation ×400. b: Periodic acid-Schiff stain, original magnification ×400
