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Table 1 Modified Cave-Wallbridge classification

From: Appendix perforation in appendix duplication in a man: a case report

Classification of types of appendix duplication Features
A [7] Single cecum with various degrees of incomplete duplication
B1 (bird type) [8] Two appendixes symmetrically placed on either side of the ileocecal valve
B2 (tenia coli type) [8] One appendix arises from the cecum at the usual site, and the second appendix branches from the cecum along the lines of the tenia at various distances from the first
B3 [2, 3] One appendix arises from the usual site, and the second appendix arises from the hepatic flexura
B4 [2, 3] One appendix arises from the usual site, and the second appendix arises from the splenic flexura
C [8] Double cecum, each with an appendix
Horseshoe appendix) [9] One appendix has two openings into a common cecum
Triple appendix [10] One appendix arises from the cecum at the usual site, and two additional appendixes arise from the colon