**Question:** Endometrial cancer involving >50% of myometrium, extending to vagina, no pelvic extension, no para aortic lymph nodes. Peritoneal lavage was positive staged as -

**Correct Answer:** A. Stage IIIA

**Core Concept:** Staging of Endometrial Cancer

Endometrial cancer staging is crucial for determining prognosis and guiding treatment decisions. The most commonly used staging system for endometrial cancer is the International Federation of Gynecology and Obstetrics (FIGO) staging system. This system classifies endometrial cancer based on the extent of the disease, which includes parameters such as myometrial invasion, lymphovascular space invasion, involvement of lymph nodes, and distant organ involvement.

**Why the Correct Answer is Right:**

In the given scenario, the cancer has invaded more than 50% of the myometrium (option A), has extended to the vagina (option A), and has positive peritoneal lavage (option A). However, there is no pelvic lymph node involvement and no para-aortic lymph node involvement. Based on these criteria, the cancer is staged as stage IIIA (option A) according to the FIGO staging system.

**Why Each Wrong Option is Incorrect:**

**Option B:** The cancer has involved the pelvic lymph nodes, which is not the case in this scenario. Stage IIIA endometrial cancer involves the myometrium and vagina, but not the pelvic lymph nodes.

**Option C:** The cancer has extended to the para-aortic lymph nodes, which is not the case in this scenario. Stage IIIA endometrial cancer involves the myometrium and vagina, but not the para-aortic lymph nodes.

**Option D:** The cancer has invaded the serosal surfaces of the uterus, which is not mentioned in the scenario. Stage IIIA endometrial cancer involves the myometrium and vagina, but not the serosal surfaces.

**Clinical Pearl:**

Understanding endometrial cancer staging is essential for guiding treatment decisions, which can involve surgery, radiation therapy, and/or chemotherapy. Stage IIIA endometrial cancer requires a combination of surgery and radiation therapy, with or without chemotherapy, depending on patient factors and tumor characteristics.

In summary, understanding the details of endometrial cancer staging helps healthcare providers make informed decisions regarding treatment options, prognosis, and potential complications for patients affected by this disease.