What is the posterior fluid dark zone?

B ultrasound shows that there is a liquid dark area behind the uterus, in fact, there is pelvic effusion. Because women after ovulation, in the coming period before there will be a small amount of physiological effusion, generally in about 10cm, no symptoms, do not need conditioning, most of them are b ultrasound examination will be found. However, if the female pelvic effusion hit 2.0 or more may show abdominal pain, abdominal drop feeling, these adverse reactions may be considered that the female is showing pelvic inflammatory disease is undergoing further gynecological examination and testing, later need to carry out anti-inflammatory conditioning, sometimes need infusion, sometimes need to use Chinese patent medicine for activating blood circulation to remove blood stasis, clearing heat and detoxifying.