Pelvic effusion 17mm is not considered serious. This is most likely a physiological effusion, which is formed when follicles rupture during ovulation and follicular fluid or intestinal lubricating fluid flows into the rectal fossa of the uterus, and is often clinically asymptomatic, without lower abdominal pain or increased vaginal discharge, and does not require treatment or intervention. If pelvic effusion of 17 mm is accompanied by lower abdominal pain and this pain is aggravated during menstruation, sex or after exertion, it is often clinically due to chronic pelvic inflammatory disease causing tissue exudation and resulting in pelvic effusion. This situation should be given active anti-inflammatory treatment clinically, you can use broad-spectrum antibiotics combined with the treatment of anaerobic bacteria metronidazole oral, continuous medication for a week, it is recommended to do lower abdominal hot compresses to promote local blood circulation, conducive to the absorption of inflammation.