Table 3.
Resection rate and risk of malignancy in patients with indeterminate A cytology (including oxyphilic follicular neoplasm)
| Cytological classification | No. (%) |
Malignancy | ROM at histology (%) | Overall ROM (%) | Histological classification (malignancy) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| FNA-cytology | Resection | FTC | FTC oxy | PTC fol | PTC macrofol | WDC-NOS | MTC | ||||
| Indeterminate A1 | 75 (48.7) | 33 (44) | 4 | 12.1 | 5.3 | 2 | 1 | - | 1 | - | - |
| Indeterminate A2 | 29 (18.8) | 20 (68.9) | 10 | 50 | 34.5 | 7 | - | - | 1 | 2 | - |
| Indeterminate A3 | 11 (7.1) | 10 (90.9) | 6 | 60 | 54.5 | 3 | - | 2 | - | - | 1 |
| Indeterminate A oxyphilic | 39 (25.3) | 22 (56.4) | 1 | 4.5 | 2.6 | - | 1 | - | - | - | - |
| 154 (100) | 85 (55.2) | 21 | 24.7 | 13.6 | 12 | 2 | 2 | 2 | 2 | 1 | |
FNA, fine-needle aspiration; ROM, risk of malignancy; FTC, follicular thyroid carcinoma; FTC oxy, follicular thyroid carcinoma, oxyphilic variant; PTC fol, papillary thyroid carcinoma, follicular variant; PTC macrofol, papillary thyroid carcinoma, macrofollicular variant; WDC-NOS, well-differentiated carcinoma, not otherwise specified; MTC, medullary thyroid carcinoma.