This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
A lady presented with carcinoma endometrium involving > 50 % of myometrium extending to vagina and positive peritoneal cytology but no involvement of para aortic and pre aortic nodes.What is the stage of disease? 
Select and explain. 
A. III A, B. III B, C. III C1, D. III C2
B: III B
Answer: B: III B 
Explanation: As discussed earlier, 50% myometrial invasion means stage IC, positive peritoneal cytology puts it in stage III-A.
Vaginal metastasis means stage III B cancer and since this is the highest stage.
Therefore, this patient has endometrial cancer belonging to stage III B.