Patient in the question is suffering from endometrial carcinoma stage IIIb as the malignancy has involved both endometrium and vagina without involvement of para aoic or pelvic lymph nodes. In stage IIIc endometrial carcinoma the malignancy spread to pelvic and para aoic lymph nodes. Positive cytology is to be repoed separately and does not influence the stage of carcinoma endometrium.