Upadacitinib for refractory ulcerative colitis with primary nonresponse to infliximab and vedolizumab: A case report

Figure 2 Colonoscopy on February 17, 2021. A: The wrinkled wall of the sigmoid colon is smooth; B: The folded shape of the lower sigmoid colon is regular and the mucosa was smooth; the submucosal vascular texture is clear. No erosion or ulceration is observed in both images.