Table 1.
CT/MRI LI-RADS Diagnostic Categories for Untreated Observations and Treatment Response Assessment Categories for Treated Observations
| LI-RADS Categories | Definition | |
|---|---|---|
| Diagnostic Algorithm | LR-NC | Not categorizable (due to image omission or degradation) |
| LR-1 | Definitely benign | |
| LR-2 | Probably benign | |
| LR-3 | Intermediate probability of malignancy | |
| LR-4 | Probably HCC | |
| LR-5 | Definitely HCC | |
| LR-M | Probably or definitely malignant, not necessarily HCC | |
| LR-TIV | Tumor in vein | |
| Treatment Response Algorithm | LR-TR Nonevaluable | Treated, response not evaluable (due to image omission or degradation) |
| LR-TR Nonviable | Treated, probably or definitely not viable | |
| LR-TR Equivocal | Treated, equivocally viable | |
| LR-TR Viable | Treated, probably or definitely viable | |