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Oh and it doesn't really look like a tumor to me. It doesn't seem to have a blood supply or vascular system.

This looks to me like a bit of tissue that got stuck in the oviduct and was just repeatedly packaged in membrane until it was large enough to finally pass. Kind of like how a candle starts with a wick, but is dipped over and over in wax. Logic would indicate that an irritant in the oviduct...