Table 5.
Representative lesions misclassified by JNET classification.
| Neoplastic | Adenoma | Tis (HGN) | Tis (HGN) | T1b | |
|---|---|---|---|---|---|
| ∼Tis (LGN) | ∼T1a | ||||
| JNET type | Type 1 | Type 2B | Type 2A | Type 3 | Type 2B |
| No. of lesions | 48 | 48 | 31 | 1 | 19 |
| Size (mm, median (IQR)) | 5 (3–6) | 16 (8–26) | 25 (16–30) | 10 | 25 (18–40) |
| Location | |||||
| Right colon | 27 (56%) | 25 (52%) | 15 (48%) | 0 | 6 (32%) |
| Left colon | 13 (27%) | 16 (33%) | 9 (29%) | 1 (100%) | 8 (42%) |
| Rectum | 8 (17%) | 7 (15%) | 7 (23%) | 0 | 5 (26%) |
| Macroscopic type | |||||
| Ip | 2 (4%) | 7 (15%) | 6 (19%) | 0 | 0 |
| Is, Is+IIc | 14 (29%) | 6 (13%) | 6 (19%) | 0 | 6 (32%) |
| IIa, IIa+IIc | 26 (54%) | 12 (25%) | 1 (3%) | 0 | 5 (26%) |
| IIb, IIc | 0 | 0 | 0 | 0 | 0 |
| LST-G | 3 (6%) | 7 (15%) | 12 (39%) | 0 | 2 (11%) |
| LST-NG | 3 (6%) | 16 (33%) | 6 (19%) | 0 | 6 (32%) |
| Pit pattern | |||||
| I | 1 (2%) | 0 | 0 | 0 | 1 (5%) |
| II | 20 (43%) | 0 | 0 | 0 | 0 |
| IIIL, IIIS, IIIH | 24 (52%) | 26 (54%) | 9 (29%) | 0 | 0 |
| IV, IVH | 1 (2%) | 4 (8%) | 14 (45%) | 0 | 0 |
| VI (noninvasive) | 0 | 17 (35%) | 6 (19%) | 0 | 7 (37%) |
| VI (invasive) | 0 | 0 | 2 (6%) | 1 (100%) | 9 (47%) |
| VN | 0 | 0 | 0 | 0 | 2 (11%) |
| Not recorded | 2 (4%) | 1 (2%) | 0 | 0 | 0 |
G: granular type; HGN: high-grade intramucosal neoplasia; IQR: interquartile range; JNET: Japan NBI Expert Team; LGN: low-grade intramucosal neoplasia; LST: laterally spreading tumour; NBI: Narrow Band Imaging; NG: nongranular type.