NCIt definition : Stage 0 includes: Tis (LAMN), N0, M0. Tis (LAMN): Low-grade appendiceal mucinous neoplasm
confined to 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 tumor involvement of regional lymph node(s). M0:
No distant metastasis. (AJCC 9th ed.);