How are liquid cysts in the ovaries formed?

Patient's question:

I had an ultrasound on December 15th. The doctor's report stated (I don't remember the specific values like chest diameter) but I do remember: "1. Fetal viability confirmed 2. A fluid-filled mass was observed in the left ovary."
I am currently 15 weeks pregnant, and the ultrasound was done at 13 weeks and 6 days. Could you please explain how the fluid-filled mass in the ovary is formed and whether it affects the baby inside?
Additionally, yesterday when I picked up my prenatal health records, the blood test report showed elevated transaminase levels. The doctor prescribed Ganoderma Lucidum Tablets and Vitamin E/C. How is the elevated transaminase level caused, and could it develop into hepatitis B?

Doctor's answer:

On the right side of the adnexal area, a liquid mass should first be considered as an ovarian cyst. If the diameter is less than 5 cm, it should be considered a physiological condition, such as a corpus luteum cyst or a follicular cyst. Regular follow-up is recommended, as these cysts often naturally disappear after a menstrual period. If the cyst diameter is greater than 5 centimeters, it is more likely to be an ovarian tumor, and surgical treatment is generally required.

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