A term that refers to the staging of appendiceal carcinoma according to the American Joint Committee on Cancer, 8th edition. This staging system applies to carcinomas of the appendix, including high-grade neuroendocrine carcinomas, mixed adenoneuroendocrine carcinomas, and goblet cell carcinoids. Well-differentiated neuroendocrine tumors (carcinoids) are staged according to the classification for neuroendocrine tumors of the appendix. (from AJCC 8th Ed.) [from NCI]