Table 3.
Histopathological characteristics of the NETs.
| Variables | n (%) |
|---|---|
| Localization; n (%) | |
| Base of appendix | 4 (12.9) |
| Mid-region of appendix | 9 (29) |
| Tip of appendix | 18 (58.1) |
| Grade; n (%) | |
| NET, G1 | 25 (80.6) |
| NET, G2 | 4 (12.9) |
| NET, G3 | 2 (6.5) |
| Size; n (%) | |
| <1 cm | 21 (67.7) |
| 1–2 cm | 10 (32.3) |
| >2 cm | 0 (0) |
| Depth of invasion; n (%) | |
| Submucosa | 9 (29) |
| Muscularis propria | 15 (48.4) |
| Serosa | 5 (16.1) |
| Mesoappendix | 2 (6.5) |
| Invasion of the mesoappendix; n (%) | |
| <3 cm | 2 (6.5) |
| >3 cm | 0 (0) |
| Vascular invasion; n (%) | 0 (0) |
| Perineural invasion; n (%) | 2 (6.5) |
| Ki-67 proliferation index; n (%) | |
| <3 | 23 (74.2) |
| 3–20 | 7 (22.6) |
| >20 | 1 (3.2) |
NET—neuroendocrine tumor.