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Comparison of T stage of appendiceal NENs between ENETS and UICC.
| ENETS | UICC | |
|---|---|---|
| T1 | Tumor ≤1 cm invading submucosa and muscularis propria | ≤2 cm (T1a, ≤1 cm; T1b, >1–2 cm) |
| T2 | Tumor ≤2 cm invading submucosa, muscularis propria and/or minimally (up to 3 mm) invading subserosa/mesoappendix | >2–4 cm; cecum |
| T3 | Tumor >2 cm and/or extensive (more than 3 mm) invasion of subserosa/mesoappendix | >4 cm; ileum |
| T4 | Tumor invades peritoneum/other organs | Perforates peritoneum; other organs or structures |
