Table 2.
Causes for failure of the endoscopic dacryocystorhinostomy.
| 1. Failure in locating the lacrimal sac |
| 2. Insuffcient osteotomy |
| 3. Granulation tissue, fbrosis or local synechia |
| 4. Bone neogenesis |
| 5. Insuffcient opening of the lacrimal sac |
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