It seems to me that could be a cancer of the ovary, but it is difficult to be sure just looking at the photos. Could also be a cancer of the lymphatic due to a virus infection. Next time, go to the nearest vet and you will have the right answer if he make a microscopic examination or if he send it to the histologist. That won't cost a lot of money and could tell you what to do if you have the same problem on a another koi. You could also put a little piece (like a cherry stone ) in formol and send it to me
|