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Hi. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. Thank you for your question. I'm sorry to hear about this situation with Elise. Foreign material from the intestinal tract can penetrate and then migrate through the abdominal cavity / organs there. I personally have had a case where a dog ate a wooden skewer that had penetrated through the stomach, migrated out of it, and then was discovered as it migrated out of the abdominal wall. In a situation like this with her, where is that pin going to go? If may stay in the position where it is and not move. As long as it is sterile, hasn't an infection associated with it, the body could just fibrous and scar it down in the area that it is in. Could it continue to migrate? That is the consideration. What could it move through and cause a potential problem with? That is totally up in the air. What clinical signs was she having going into the surgery?
Mine didn't specifically penetrate the liver, but if that canula is "sterile" it may be in that tissue as a benign object. As long as it didn't drag bacteria into the tissue and doesn't migrate through structures of importance - major vessels, bile ducts, gall bladder etc.., then it has the chance of being a benign object in that tissue.