What is a pelvic fluid mass?

Patient's question:

I have a friend who is 19 years old. A few days ago, she went for a physical examination, and the results of her ultrasound are as follows. Could you help me understand what the disease is and how it should be treated? Thank you!
Her ultrasound report is as follows:
Uterus is in an anterior position, size 3.8 x 2.8 x 2.1 cm, regular shape, homogeneous muscle wall echoes, endometrial line is central. A 4.0 x 3.5 x 2.8 cm liquid mass was detected at the posterior position of the uterus, with clear boundaries and good internal echo transmission.
Suggestions:
1. The uterus is smaller than normal.
2. Liquid mass in the pelvic cavity.
Question: What is this liquid mass?

Doctor's answer:

Pelvic effusion is divided into two types: physiological and pathological. The peritoneum, which surrounds the abdominal organs of the human body, requires a certain amount of lubricating fluid. The rectouterine pouch is the lowest part of the body, so if there is any fluid, it will appear there. Physiological effusion usually occurs during the premenstrual period, ovulation, and other times. Pelvic effusion is divided into two types: physiological and pathological. Physiological effusion usually occurs during the premenstrual period, ovulation, and other times. Pathological effusion generally occurs during conditions such as pelvic inflammatory disease, ectopic pregnancy rupture, or rupture of pelvic masses, and so on. As for whether your pelvic effusion is related to an ovarian cyst, you need to provide the specific details of your report, including the nature of the cyst, whether it is solid or cystic. In most cases, it is likely to be considered a physiological cyst that requires observation and follow-up. There is no need to worry excessively, as many people have such cysts, and physiological cysts often resolve on their own without treatment!

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