| 0 | No detectable tumor nodules |
| 1 | One to four small nodules, and no medium or large nodules |
| 2 | More than four small nodules, and no medium or large nodules |
| 3 | Unlimited number of small nodules, plus one to two medium, and no large nodules |
| 4 | Unlimited number of small nodules, plus three or more medium, and no large nodules |
| 5 | Unlimited number of small and medium nodules, but no more than one large nodule |
| 6 | Unlimited number of small and medium nodules, but no more than two large nodules |
| 7 | Unlimited number of small and medium nodules, and three or more large nodules |