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Accuracy of non-guided FNA cytodiagnosis according to first FNA (number of FNAs) or most meaningful FNA when it was repeated (number of patients)
| FNAs No. (%) | Patients No. (%) | |
| True positive | 151(74.4) | 138(80.7) |
| True negative | 104(99.0) | 93(98.9) |
| False positive | 1(1.0) | 1(1.1) |
| False negative | 52(25.6) | 33(19.3) |
| Non-diagnostic | 24(7.2) | 14(5.0) |
| Total | 332 | 279 |
