The principal lymphatic drainage of the cervix of the uterus is the preureteral chain of lymphatics, which follow the course of the uterine artery (16) in front of the ureters and drain into the external iliac (18), the common iliac (19), and obturator lymph nodes. Lesser drainage is by way of the retroureteral lymphatics, which follow the course of the uterine vein, pass behind the ureter, and end in the internal iliac (hypogastric) lymph nodes (20). The posterior lymphatics of the cervix, less constant than the other two, follow an anteroposterior direction on each side of the rectum to end in the para-aortic lymph nodes found at the aortic bifurcation (21).