Comparison of non-schistosomal rectosigmoid cancer and schistosomal rectosigmoid cancer

Figure 1 Quantities of CEA, CA19-9 and CA125 in the peripheral blood of patients who had rectosigmoid carcinoma with or without schistosomiasis. Dotted lines define the normal values. RSC: Rectosigmoid carcinoma; Sch: Schistosomiasis.

Figure 2 Endoscopic findings showing different morphological characteristics of schistosomiasis combined with rectal cancer. A: Annular; B: Fungating mass; C: Cauliflower-like mass; D: Congestive, ulcerative (black arrow).

Figure 3 Computed tomography presentation. A: Computed tomography (CT) scan showing curvilinear calcification in the rectosigmoid colon and calcified, conglomerate nodules (arrow) protruding from the wall of the rectosigmoid colon; B: Lobulated polypus in the rectum; C, D: CTVC enables three-dimensional view of walls of the colon as a result of reconstruction of multislice CT images. The colorectal stenosis is showed in the area surrounding by dotted lines. CTVC: CT virtual colonoscopy.

Figure 4 Pathological features of schistosomiasis-associated rectal adenocarcinoma. A, B: Schistosomiasis ova in tumor adjacent tissues. C, D: Schistosomiasis ova in tumor tissues.