Inverted cystic tubulovillous adenoma involving Brunner’s glands of duodenum

Figure 2 A: Inverted cystic lesion extends along the Brunner gland duct into the submucosa (HE, × 15); B: Normal or hyperplastic Brunner’s glands (arrows) are seen beneath the tubulovillous adenomatous lesion growing into the cyst lumen (HE, × 40); C: The flat surface epithelium and small mucus glands (arrows) are seen among the villiform epithelium (HE, × 40).