Posterior translucency enhancement of pelvic cysts is a result of imaging examination, which mostly suggests the presence of acute pelvic inflammatory disease, pelvic cysts, ovarian cancer and other diseases. 1. Acute pelvic inflammatory disease: Acute pelvic inflammatory disease is caused by bacterial anaerobic bacteria, aerobic bacteria and other pathogens, the main symptoms of patients are chills, high fever, headache, lower abdominal distension, lumbago, urinary urgency, etc., and the patients have the manifestation of pelvic cysts with posterior transducer enhancement in the imaging examination. 2. Pelvic cysts:The etiology of pelvic cysts is not yet clear, and it is considered to be caused by a variety of pathogenic factors. Patients will have abdominal pain, dysmenorrhea, abnormal uterine bleeding, ascites and other symptoms, and they will also have the manifestation of posterior translucency enhancement of pelvic cysts when doing imaging examination. 3. Ovarian cancer:The cause of ovarian cancer has not been completely clarified, and it may be caused by genetic, hormonal and other factors. The main symptoms of patients are lower abdominal discomfort, abdominal distension, anemia, emaciation, etc., which may also lead to the phenomenon of posterior translucency enhancement of pelvic cysts when patients do imaging examination. When the phenomenon of pelvic cyst posterior translucency enhancement occurs during imaging, the patient should consult a doctor in time and follow the doctor’s instructions for treatment.