Table 3.
Time and method of diagnosis
| Time | Method | No. of cases |
|---|---|---|
| Preoperative | Endoscopy | 12 |
| Curettage of fistula | 3 | |
| Direct tumor biopsy | 2 | |
| Intraoperative | Pathological examination | 3 |
| Postoperative | Pathological examination | 14 |
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