Table 4.
Thyroid FNA risk of malignancy (ROM) in adults according to current TBSRTC (The Bethesda System for Reporting Thyroid Cytopathology), SIAPEC (Società Italiana di Anatomia Patologica e di Citopatologia diagnostica) and BTA (British Thyroid Association) reporting thyroid cytology classifications [23,25,26].
| Adults | |||||
|---|---|---|---|---|---|
| TBSRTC | ROM (%) |
SIAPEC | ROM (%) |
BTA | ROM (%) |
| I | 1–4 | TIR1-TIR1c | nd | THY1-THY1c | 4 |
| II | <3 | TIR2 | <3 | THY2-THY2c | 1.4 |
| III | 5–15 | TIR3A | <10 | THY3a | 17 |
| IV | 15–30 | TIR3B | 15–30 | THY3b | up to 40 |
| V | 60–75 | TIR4 | 60–80 | THY4 | up to 68 |
| VI | 97–99 | TIR5 | >95 | THY5 | up to 100 |