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The predictive results of pre- and post-NACT MRI for the necessity of RR
| RR group | Non-RR group | Sensitivity | Specificity | PPV | NPV | Accuracy | ||
|---|---|---|---|---|---|---|---|---|
| Pre-NACT MRI | RR group | 8 | 1 | 100.0% | 85.7% | 88.9% | 85.7% | 93.3% |
| Non-RR group | 0 | 6 | ||||||
| Post-NACT MRI | RR group | 1 | 0 | 12.5% | 100.0% | 100.0% | 50.0% | 53.3% |
| Non-RR group | 7 | 7 | ||||||
NACT neoadjuvant chemotherapy, RR rectosigmoid resection, PPV positive predictive value, NPV negative predictive value
