Table 3.
Preoperative vs. pathological T staging in five rectal segments
| T stage | uT0 | uT1 | uT2 | uT3 | uT4 | |
|---|---|---|---|---|---|---|
| SEG I (1, 3]*, cm |
ypT0 | 2 | 3 | 4 | 4 | 0 |
| ypT1 | 0 | 3 | 2 | 1 | 0 | |
| ypT2 | 0 | 0 | 6 | 3 | 2 | |
| ypT3 | 0 | 0 | 3 | 17 | 1 | |
| ypT4 | 0 | 0 | 0 | 1 | 3 | |
| SEG II (3, 6], cm |
ypT0 | 16 | 5 | 6 | 5 | 0 |
| ypT1 | 0 | 4 | 0 | 0 | 1 | |
| ypT2 | 0 | 0 | 19 | 1 | 3 | |
| ypT3 | 0 | 0 | 1 | 46 | 2 | |
| ypT4 | 0 | 0 | 0 | 1 | 13 | |
| SEG III (6, 9], cm |
ypT0 | 2 | 1 | 6 | 2 | 0 |
| ypT1 | 0 | 0 | 0 | 0 | 0 | |
| ypT2 | 0 | 0 | 4 | 1 | 0 | |
| ypT3 | 0 | 0 | 0 | 13 | 0 | |
| ypT4 | 0 | 0 | 0 | 1 | 2 | |
| SEG IV (9, 12], cm |
ypT2 | 0 | 0 | 0 | 0 | 1 |
| ypT3 | 0 | 0 | 1 | 1 | 0 | |
| ypT4 | 0 | 0 | 0 | 1 | 0 | |
| SEG V (12, 16], cm |
ypT0 | 0 | 0 | 1 | 0 | 0 |
| ypT2 | 0 | 0 | 1 | 0 | 0 | |
| ypT3 | 0 | 0 | 0 | 1 | 0 | |
| ypT4 | 0 | 0 | 0 | 1 | 1 |
* (a, b] means a value larger than a, but no more than b. Abbreviations: uT, ultrasonographic T stage; ypT, pathological T stage after neoadjuvant therapy; SEG, rectal segment.