Table 2. Histopathological features, T stage, and distribution of ANs (N=12).
LAMN: Low-grade appendiceal mucinous neoplasm; HAMN: High-grade appendiceal mucinous neoplasm; AN: Appendiceal neoplasm
| ANs subtypes | N (%) |
| Neuroendocrine tumor | 9 (75%) |
| Well-differentiated (G1) | 9 (100%) |
| Moderately differentiated (G2) | |
| Poorly differentiated (G3) | |
| Mitotic rate | |
| <2 | 9 (100%) |
| Ki-67% | |
| <2% | 9 (100%) |
| Mucinous neoplasm of appendix | |
| LAMN | 1 (8.3%) |
| HAMN | 0 |
| Adenocarcinoma | 1 (8.3%) |
| Well-differentiated | 0 |
| Moderately-differentiated | 1 (100%) |
| Poorly differentiated | 0 |
| Goblet cell adenocarcinoma | 1 (8.3%) |
| Well-differentiated | 0 |
| Moderately-differentiated | 1 (100%) |
| Poorly differentiated | 0 |
| Location | |
| Proximal half | 2 (16.6%) |
| Distal half | 6 (50%) |
| Tip of appendix | 3 (25%) |
| Diffuse | 1 (8.4%) |
| Size | |
| <2cm | 9 (75%) |
| 2-4cm | 1 (8.4%) |
| >4cm | 2 (16.6%) |
| Perforated | 1 (8.4%) |
| Non-perforated | 11(91.6%) |
| Lymphovascular invasion | 2 (16.6%) |
| Perineural invasion | 2 (16.6%) |
| Margin | |
| Involved | 0 |
| Not involved | 12 (100%) |
| Regional lymph nodes | 0 |
| Immunohistochemistry | |
| Chromogranin | 9 (75%) |
| Synaptophysin | 6 (50%) |
| CDX2 | 1(8.3%) |
| T stage | |
| pTis | 1 (8.3%) |
| pT1 | 3 (25%) |
| pT2 | 1 (8.4%) |
| pT3 | 6 (50%) |
| pT4a | 1 (8.3%) |