Laparotomy performed in a case of ovarian tumor revealed unilateral ovarian tumor with ascites positive for malignant cells and positive pelvic lymph nodes. All other structures were free of disease. What is stage of the disease?
**Core Concept:** Staging of ovarian cancer is based on the extent of disease spread, which is determined by the presence and extent of involvement of various organs and structures. The most commonly used staging system is the International Federation of Gynecology and Obstetrics (FIGO) staging system.
**Why the Correct Answer is Right:** In this scenario, the patient has a unilateral ovarian tumor with ascites positive for malignant cells and positive pelvic lymph nodes. Based on the FIGO staging system, this indicates stage IIIC ovarian cancer. Stage IIIC involves ovarian cancer with spread to pelvic lymph nodes and/or distant spread.
**Why Each Wrong Option is Incorrect:**
A. This option refers to stage I ovarian cancer, which involves only the ovaries without any spread to pelvic lymph nodes or distant organs.
B. This option refers to stage II ovarian cancer, which involves the ovaries and pelvic lymph nodes but not distant organs. In this case, the ovarian tumor is already spread to pelvic lymph nodes (stage IIIC), so this option is incorrect.
C. This option refers to stage IV ovarian cancer, which involves the ovaries, pelvic lymph nodes, and distant organs. In this case, the presence of positive pelvic lymph nodes already classifies the patient into stage IIIC, not stage IV.
D. This option refers to stage III ovarian cancer, which involves the ovaries and pelvic lymph nodes but not distant organs. In this case, the presence of positive pelvic lymph nodes already classifies the patient into stage IIIC, not stage III.
**Clinical Pearl:** The FIGO staging system is essential for determining the prognosis, treatment options, and predicting the likelihood of response to treatment in patients with ovarian cancer. Understanding this system aids in making informed decisions regarding treatment plans and predicting the patient's prognosis.
**Correct Answer:** C. Stage IIIC ovarian cancer, as the patient has a unilateral ovarian tumor with ascites positive for malignant cells and positive pelvic lymph nodes, which is indicative of stage IIIC according to the FIGO staging system.