Abnormalities found on my cats ovaries?

I took my 11 month old cat to vet on Monday because I felt lumps underneath 3 of her mammary glands. He examined her and said the best course of action would be spaying as he thought it was a hormonal issue, I agreed as I had planned on spaying her anyway.

She was spayed today and the vet said he found some abnormalities on her ovaries and said that was most likely the cause of the problem, he also described them as follicles. And said the cause was most likely due to her genetics.

This makes sense as I believe that she is probably slightly inbred, she came from the home of a woman who many cats with varying diseases and all un-spayed and un-neutered and basically feral. I found her across the street from this house when she was four weeks old, she was cold and had clearly been dropped by her mum when she was moving her kittens. She also had a severely infected eye. So I took her home and the rest is history.

So could the above be the causation and what exactly are these follicles or abnormalities?