This is the uterus of a 7 year old, intact female cat. She came in for having a foul discharge coming from her vulva 3 days prior and now she had stopped eating. This is a picture of her uterus filled with pus (Pyometra) which can happen between heat cycles when bacteria counts are high especially. This luckily was an open pyometra, which means that the cervix is open and allows the pus to drain out of the cat. If it had been a closed pyometra, the cervix would have been closed and the uterus would have gotten so pus filled that it would have ruptured!!!