Massive gastrointestinal bleeding: An unusual case of asymptomatic extrarenal, visceral, fibromuscular dysplasia

Figure 1 Microscopic sections showing marked thickening (A) and hyalinization (B) of medium sized vessel walls with prominent eccentric intimal proliferation with no arteritis, necrosis, inflammation and calcification (hematoxylin-eosin, original magnification × 200); sparing of small sized vessels (C) (hematoxylin-eosin, original magnification × 200); focal evidence of recent vascular thrombosis with early organization in one vessel (D) (hematoxylin-eosin, original magnification × 200); Verhoeff’s Van Gieson elastic stain highlighting the prominent intimal hyperplasia (E) (original magnification × 200; Masson’s trichrome stain highlighting a loose matrix of fibrous tissue replacing and expanding the intima (F) (original magnification × 200).