Is pelvic effusion 21mm serious?

Pelvic effusion is the result of ultrasound diagnosis, pelvic effusion has physiological and pathological two kinds. Physiological pelvic effusion may be due to each ovulation and menstruation and show a small amount of effusion, can be in different stages of the menstrual cycle ultrasound examination, to understand whether pelvic effusion can be absorbed. Pelvic effusion 21mm belongs to the physiological range, there is a pathological effusion, in the case of a lot of effusion called ascites, may be related to liver and kidney dysfunction and malignant tumors. If the amount of effusion is small, it may be related to pelvic infection, so it is necessary to further clarify whether it is caused by tumor or infection factors.