Inversion-ligation appendectomy involves the following steps: (1) skeletonizing the appendix from its mesentery; (2) inverting the appendix via a blunt probe into the cecal lumen; (3) ligating the remaining nubbin of tissue; and (4) inverting the nubbin with a purse-string stitch. This procedure allows the surgeon to perform incidental appendectomy while avoiding transection of the appendiceal lumen with its attendant risk of enteric bacterial contamination.