Table 3.
Cytopathological results for the Osaka Medical College (OMC) system for salivary gland tumors
| 1-1 Inadequate | 1-2 Cyst contents | 2 Non-neoplastic | 3 AUS | 4-1 Benign: (histology confirmed) | 4-2 Benign: (histology unconfirmed) | 5 SUMP | 6-1 Suspicious for malignancy | 6-2 Malignant: (only) | 6-3 Malignant: (grade confirmed) | 6-4 Malignant: (histology/grade confirmed) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Malignant (n = 194) (113/81) | 26 (18/8) | 2 (2/0) | 5 (4/1) | 0 | 12 (9/3) | 13 (13/0) | 23 (15/8) | 13 (10/3) | 18 (7/11) | 21 (6/15) | 61 (29/32) |
| Benign (n = 981) | 133 | 20 | 27 | 8 | 717 | 38 | 26 | 4 | 3 | 1 | 4 |
| Total (%) | 13.5 | 1.9 | 2.7 | 0.7 | 62.0 | 4.3 | 4.2 | 1.4 | 1.8 | 1.9 | 5.5 |
| Risk of malignancy (ROM) (%) | 16.4 | 9.1 | 15.6 | 0.0 | 1.6 | 25.5 | 46.9 | 76.5 | 85.7 | 95.5 | 93.8 |
The number in parentheses indicates each case by histological grade (low or intermediate/high grade)
AUS atypia of undetermined significance, SUMP salivary gland neoplasm of uncertain malignant potential