Table 2.
Comparison of the Milan System and Osaka Medical College classification.
| Milan System | Osaka Medical College Classification | |
|---|---|---|
| I. Non-diagnostic |
|
1-1 Inadequate |
|
1-2 Cyst contents | |
| II. Non-neoplastic |
|
2 Non-neoplastic |
| III. AUS |
|
3 AUS |
| IV. Neoplasm |
|
4-1 Benign tumor (histology confirmed) |
| IVA. Neoplasm—benign | 4-2 Benign tumor (histology unconfirmed) | |
| IVB. Neoplasm—SUMP |
|
5 SUMP |
| V. Suspicious for malignancy | 6-1 Suspicious for malignancy | |
| VI. Malignant |
|
6-2 Malignant (grade/histology unconfirmed) |
| 6-3 Malignant (grade confirmed) | ||
| 6-4 Malignant (grade/histology confirmed) |
AUS, atypia of undetermined significance; SUMP, salivary gland neoplasm of unknown malignant potential.