Fig. 3

Postoperative findings. a. The appendiceal mucosa was completely everted, and the appendix measured 11 × 1.5 × 1.5 cm. The entire appendix mucosa is almost tubulovillous adenoma superficially. b and c. Microscopic examination of the resected specimen indicated a tubulovillous adenoma with local high-grade intraepithelial neoplasia (b: hematoxylin/eosin [H&E], original magnification × 100; c: H&E original magnification × 200)