The methods for diagnosing ovarian cancer include imaging studies, such as ultrasonography of the adnexa of the uterus, abdominal CT, or MRI, which can detect ovarian tumors. The next step is to perform a blood test for the tumor marker CA125, which is a relatively specific and sensitive marker for epithelial ovarian cancer; in clinical practice, CA125 levels are generally significantly elevated in patients with ovarian cancer. Additionally, many patients with ovarian cancer, especially those in advanced stages, often develop significant ascites. We can perform abdominal paracentesis to drain the fluid and test the ascites for cancer cells. If cancer cells are found in the ascites and imaging studies reveal an ovarian mass, ovarian cancer can be diagnosed. Furthermore, chest CT and other tests are included to comprehensively assess the staging of the patient.