Table 1. Clinicopathological characteristics of 41 lesions in 41 patients with duodenal tumors larger than 20 mm who underwent duodenal ESD.
| Sex (male/female), n | 29 /12 |
| Age (y), mean ± SD | 60.7 ± 9.0 |
| Range | (34 – 77) |
| Tumor location, n | |
| First portion (anterior/posterior) | 4 /2 |
| SDA (inner curve/outer curve) | 6 /1 |
| Second portion (inner curve/outer curve) | 7 /19 |
| IDA inside | 1 |
| Third portion posterior | 1 |
| Macroscopic findings, n | |
| Protruded/flat elevated | 3 /36 |
| Depressed | 2 |
| Preoperative biopsy finding, n | |
| No biopsy | 16 |
| Low-grade dysplasia | 17 |
| High-grade dysplasia | 5 |
| Adenocarcinoma | 3 |
| Histology, n | |
| Adenocarcinoma (M/SM) | 13 (12 /1) |
| Adenoma with high-grade dysplasia | 26 |
| Adenoma with low-grade dysplasia | 2 |
Abbreviations: ESD, endoscopic submucosal dissection; IDA, inferior duodenal angle; M, intramucosal invasion; SD, standard deviation; SDA, superior duodenal angle; SM, submucosal invasion.