Table 4. Magnetic resonance findings of patients with ypT0 and ypTis.
| Parameters | ypT0 (%) | ypTis (%) | P-value |
|---|---|---|---|
| Before NCT | |||
| Mean Size ± SD | 30.5 ± 19.9 | 32.1 ± 17.4 | 0.656a |
| BPE | |||
| 1 | 56 (60.2) | 37 (39.8) | 0.452b |
| 2 | 8 (44.4) | 10 (55.6) | |
| 3 | 3 (50.0) | 3 (50.0) | |
| Presentation of main lesion | |||
| Mass | 59 (62.1) | 36 (37.9) | 0.028 |
| Non-mass enhancement | 8 (36.4) | 14 (63.6) | |
| Shape | |||
| Round | 14 (60.9) | 9 (39.1) | 0.282 |
| Oval | 39 (61.9) | 24 (38.1) | |
| Irregular | 14 (45.2) | 17 (54.8) | |
| Margin | |||
| Circumscribed | 13 (65.0) | 7 (35.0) | 0.403b |
| Irregular | 48 (53.9) | 41 (46.1) | |
| Spiculated | 6 (75.0) | 2 (25.0) | |
| Internal enhancement | |||
| Heterogeneous | 34 (50.0) | 34 (50.0) | 0.133 |
| Homogeneous | 26 (70.3) | 11 (29.7) | |
| Rim enhancement | 7 (58.3) | 5 (41.7) | |
| Time-intensity curve | |||
| Washout | 64 (95.5) | 49 (98.0) | 0.830 |
| Plateau or persistent | 3 (4.5) | 1 (2.0) | |
| T2WI | |||
| High | 42 (58.3) | 30 (41.7) | 0.768 |
| Iso or low | 25 (55.6) | 20 (44.4) | |
| Presence of necrosis | |||
| No | 58 (56.9) | 44 (43.1) | 0.819 |
| Yes | 9 (60.0) | 6 (40.0) | |
| Peritumoral edema | |||
| No | 48 (57.1) | 36 (42.9) | 0.966 |
| Yes | 19 (57.6) | 14 (42.4) | |
| After NCT | |||
| Complete response | 47 (74.6) | 16 (25.4) | <0.001 |
| Residual disease | 20 (37.0) | 34 (63.0) |
BPE, Background parenchymal enhancement; T2WI, T2-weighted image.
aIndependent samples t-test.
bFisher’s exact test.