A categorical score (A, B, Treated) assigned to LR4 or 5 observations or to treated LR5 observations and biopsy-proven HCC lesions as follows:
The designations A and B are assigned to LR4 or 5 observations based on their diameter. LR4 or 5 observations < 20mm are designated A. LR4 or 5 observations ≥ 20mm are designated B.
The designation Treated is assigned to LR5 observations or biopsy-proven HCC lesions that have undergone loco-regional treatment.