If the knot you describe is an opening in the surgery site, creating a hernia, resuturing the area may be needed. Anytime there is a question after surgery about the viability of the surgery site, have your veterinarian check it. The surgery rechecks by the surgeon who spayed your cat are usually part of the initial fee. Have him or her check the cat to be sure. In the vast majority of the cases, the knot is caused by scar tissue or fluid in the area.
Hernias are the least likely to occur, but can be the most serious if the abdominal wall opens up.
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