NCIt definition : Stage 0 includes: Tis(LAMN), N0, M0. Tis(LAMN): Low-grade appendiceal mucinous neoplasm
confined by the muscularis propria. Acellular mucin or mucinous epithelium may invade
into the muscularis propria. T1 and T2 are not applicable to LAMN. Acellular mucin
or mucinous epithelium that extends into the subserosa or serosa should be classified
as T3 or T4a, respectively. N0: No regional lymph node metastasis. M0: No distant
metastasis. (AJCC 8th ed.);