Solid ovarian cyst?

Hi, I am 22 and i have never had sex or any contact w any guy. I had some pain while urinating so i decided to visit a doctor. She said that ultrasonography is needed. After the ultrasonography i was told that “There is a small amount of free fluid in the fossa of Douglas. In the left ovary there is a cyst containing solid components with a size of 35X29mm”.

since i am virgin and i dont have any stds, how can i have a solid ovarian cyst? Is it possible for a virgin person to have these? Can there be a mistake?

Solid ovarian cyst?
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