Pelvic encapsulated fluid is caused by chronic pelvic inflammatory disease, endometriosis, surgery, etc. It can be diagnosed by pelvic ultrasonography and pelvic CT examination. 1. Pelvic ultrasonography: the pelvic cavity is characterized by a cystic mass with regular morphology and clear peritoneum, which may be separated by several segments, with poor intracapsular translucence and a fixed location that does not change with the body position. 2. Pelvic CT: round or round-like cystic density shadow can be seen on pelvic CT, with smooth peritoneum, which can be separated and calcified; inside the peritoneum, there is liquid density shadow. The appearance of encapsulated effusion need to go to the hospital for examination, identify the cause of the disease, and actively cooperate with the doctor for treatment.