Table 2 The classification of appendiceal anomalies

•Number anomalies

1. Agenesis: absence of appendix

2. Duplex appendix

A: partial duplication with both appendices sharing a common base like “Y-shaped” on a single cecum

B: complete duplication of the appendix on a single cecum

•B1 avian type: two appendices symmetrically placed on either side of the ileocecal valve

•B2 tenia-coli cecum type: one appendix arising from the usual site of the cecum and the other arising from the cecum along the tenia

•B3 tenia-coli hepatic flexure type: one appendix arising from the usual site of the cecum and the other arising from the hepatic flexure of the colon along the tenia.

•B4 tenia-coli splenic flexure type: one appendix arising from the usual site of the cecum and the other arising from the splenic flexure of the colon along the tenia.

C: duplication of the cecum, each having its own appendix

3. Triplex appendix: complete triplication of appendix on the cecum

• Shape anomalies

 Horseshoe Appendix

Disposal of the mesentery

• Sagittal disposal: the both bases of the appendix along the tenia in sagittal direction

• Frontal disposal: the bases of the appendix not on the tenia

Location of the orifice

• Cecum-cecum

• Cecum-ascending colon