2017 2018 2019 2020
Clinical symptoms Abdominal pain Abdominal pain with diarrhoea, mucopurulent and bloody stools Abdominal pain, diarrhoea, bloody stool Abdominal pain, diarrhoea, bloody stool, fever
Endoscopically confirmed site of involvement Ascending colon, transverse colon, descending colon Ascending colon, transverse colon, descending colon Ileocecal region, ascending colon, transverse colon, descending colon Ileocecal region, ascending colon, transverse colon, descending colon, small intestine
Intestinal stricture NO NO YES YES
Maximum ulcer diameter (cm) 0.5 0.5 Circumflex 3/4 5
Pathological biopsy Acute and chronic inflammation of the colonic mucosa Acute and chronic inflammation of the colonic mucosa Acute and chronic inflammation of the colonic mucosa Lymphocytes and inflammatory cells infiltrate the lamina propria, intraepithelial lymphocytes, cryptitis, and crypt abnormalities