Cervical cancer is a common gynecologic malignancy. The following four diagrams will help you understand the clinical stages of cervical cancer at a glance: Stage I: lesions are confined to the cervix. (Figure 1) (Figure 1) Stage IIa: lesions invade the upper third of the vagina. stage IIb: lesions invade the parametrium. (Figure 2) (Figure 2) Stage IIIa: lesion accumulates in the lower 1/3 of the vagina. stage IIIb: lesion extends to the pelvic wall or (and) hydronephrosis. (Figure 3) (Figure 3) Stage IVa: Lesion extends to the bladder, rectal mucosa or beyond the true pelvis. stage IVb: Lesion extends beyond the pelvis, such as the abdomen, liver, intestines, lungs, and bones. (Figure 4) (Figure 4)