FIGURE 1: Modified Cave-Wallbridge classification. Type A, partial duplication of the appendix; Type B1 (bird type), two appendices are placed symmetrically on both sides of the ileocaecal valve; Type B2 (taenia coli type), one appendix is in the usual place, and the other is far along with the taenia coli; Type C, duplication of the caecum and appendix; Type D (horseshoe type), one appendix has two openings in the caecum(2).