Fig. 5

Modified Cave-Wallbridge classification. Type A: partial duplication of the appendix; Type B1 (bird type): two appendices symmetrically placed on both sides of the ileocecal valve; Type B2 (taenia coli type): one appendix in the usual position and the other along the taenia coli; Type C: duplication of cecum and appendix; Type D (horseshoe type): a single appendix with two openings in the cecum [13]