Mucocele of the appendix: An unusual cause of lower abdominal pain in a patient with ulcerative colitis-. A case report and review of literature

Figure 1 Manifestations of appendiceal mucocele. A: Peculiar internal echogenicity of onion skin design, occupying a part of the cavity in appendiceal mucocele; B: Presence of a pericaecal 11 cm×3.5 cm cystic lesion in the right lower abdomen (arrows) shown by axial CT.

Figure 2 Findings in mucocele at operation. A: Macroscopic finding in the mucocele at operation; B: Internal part of the cyst after opened.

Figure 3 Histological findings. A and B: Appendix, mucin-filled lumen lined with atypical mucin-producing columnar epithelium and no infiltration in muscular wall, H&E, ×40, ×60; C: Submucosa loaded with chronic inflammatory cells, H&E, ×20; D: Normal colonic mucosa in the cecum, and thickened submucosa, H&E, ×20.