Endometriosis of the duplex appendix: A case report and review of the literature

Table 1 New classification of appendiceal anomalies

Number anomalies
Agenesis: Absence of appendix
Duplex appendix
Type A: Partial duplication with both appendices sharing a common base like ‘’ Y-shaped’’ on a single cecum
Type 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
Type C: Duplication of the cecum, each having its own appendix
Triplex appendix: Complete triplication of appendix on the cecum
Horseshoe appendix
With sagittal disposal: The bases of the appendix are along the tenia in sagittal direction
With frontal disposal: The bases of the appendix are not on the tenia

Data from these studies[4,10-13].