1. Mutinga ML, Odze RD, Wang HH, Hornick JL, Farraye FA. The clinical significance of right-sided colonic inflammation in patients with left-sided chronic ulcerative colitis. Inflamm Bowel Dis 2004;10:215-219.
2. Choi YS, Kim WJ, Kim JK, Kim DS, Lee DH. Efficacy of topical 5-aminosalicylate monotherapy in patients with ulcerative proctitis with skip inflammation. J Gastroenterol Hepatol 2018;33:1200-1206.
3. Ruuska T, Vaajalahti P, Arajärvi P, Mäki M. Prospective evaluation of upper gastrointestinal mucosal lesions in children with ulcerative colitis and Crohn’s disease. J Pediatr Gastroenterol Nutr 1994;19:181-186.
4. Kaufman SS, Vanderhoof JA, Young R, Perry D, Raynor SC, Mack DR. Gastroenteric inflammation in children with ulcerative colitis. Am J Gastroenterol 1997;92:1209-1212.
5. Mitomi H, Atari E, Uesugi H, et al. Distinctive diffuse duodenitis associated with ulcerative colitis. Dig Dis Sci 1997;42:684-693.
6. Thompson JW 3rd, Bargen JA. Ulcerative duodenitis and chronic ulcerative colitis: report of two cases. Gastroenterology 1960;38:452-455.
7. Valdez R, Appelman HD, Bronner MP, Greenson JK. Diffuse duodenitis associated with ulcerative colitis. Am J Surg Pathol 2000;24:1407-1413.
8. Terashima S, Hoshino Y, Kanzaki N, Kogure M, Gotoh M. Ulcerative duodenitis accompanying ulcerative colitis. J Clin Gastroenterol 2001;32:172-175.
9. Rubenstein J, Sherif A, Appelman H, Chey WD. Ulcerative colitis associated enteritis: is ulcerative colitis always confined to the colon? J Clin Gastroenterol 2004;38:46-51.
10. Kawai K, Watanabe T, Nakayama H, Roberts-Thomson I, Nagawa H. Images of interest. Gastrointestinal: small bowel inflammation and ulcerative colitis. J Gastroenterol Hepatol 2005;20:1791.
11. Hori K, Ikeuchi H, Nakano H, et al. Gastroduodenitis associated with ulcerative colitis. J Gastroenterol 2008;43:193-201.
12. Akitake R, Nakase H, Tamaoki M, Ueno S, Mikami S, Chiba T. Modulation of Th1/Th2 balance by infliximab rescues postoperative occurrence of small-intestinal inflammation associated with ulcerative colitis. Dig Dis Sci 2010;55:1781-1784.
13. Hisabe T, Matsui T, Miyaoka M, et al. Diagnosis and clinical course of ulcerative gastroduodenal lesion associated with ulcerative colitis: possible relationship with pouchitis. Dig Endosc 2010;22:268-274.
14. Lin J, McKenna BJ, Appelman HD. Morphologic findings in upper gastrointestinal biopsies of patients with ulcerative colitis: a controlled study. Am J Surg Pathol 2010;34:1672-1677.
15. Chiba M, Ono I, Wakamatsu H, Wada I, Suzuki K. Diffuse gastroduodenitis associated with ulcerative colitis: treatment by infliximab. Dig Endosc 2013;25:622-625.
16. Willington AJ, Taylor G, White J, Gearry RB. Gastrointestinal: ulcerative colitis-associated duodenitis. J Gastroenterol Hepatol 2018;33:973.
17. Byeon JS, Yang SK, Myung SJ, et al. Clinical course of distal ulcerative colitis in relation to appendiceal orifice inflammation status. Inflamm Bowel Dis 2005;11:366-371.
18. Naves JE, Lorenzo-Zúñiga V, Marín L, et al. Long-term outcome of patients with distal ulcerative colitis and inflammation of the appendiceal orifice. J Gastrointestin Liver Dis 2011;20:355-358.