Idiopathic mesenteric phlebosclerosis associated with long-term oral intake of geniposide

Figure 7 Histologic examination of the biopsy specimen of case 2. A: Hematoxylin and eosin staining revealed marked fibrosis of the deep layer of the mucosa wall thickening of the venules (× 40); B: Masson’s trichrome stain indicated that the deposits were stained blue, suggesting that they were collagen fibers (× 40); C: Congo red staining revealed absence of vitreous deposition, excluding amyloidosis (× 40).