Have you had your appendix removed?
I've never had my innards (abdominal or thoracic) invaded. Numerous parts carved off the exterior, though. Entering the major body cavity seems far more invasive.
Just thyroid removed. Everything else is original.
I imagine that's not a fun one to live without.
No, my parts count is actually higher than as originally designed. Minus two wisdom teeth; plus two titanium brackets and at least four titanium screws.