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Reasons for Undiagnostic Procedure
| FNA group | FNB group | |
|---|---|---|
| Total undiagnostic procedure | 10 | 4 |
| Atypical cell without stromal invasion | 5 | 0 |
| Scant of cell | 2 | 1 |
| IHC stain negative | 1 | 1 |
| Blood clot | 1 | 1 |
| Sampling error | 1 | 1 |
FNA, fine needle aspiration; FNB, fine needle biopsy.
