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Summary of unsuccessful endoscopic stone retrieval cases
| Reason of failure | Gland | Stone size (mm) | Stone location | Approach |
|---|---|---|---|---|
| Inability to introduce the endoscope | Submandibular | 4 | Main duct | Open |
| Duct perforation | Submandibular | 5 | Main duct | Open |
| Inability to navigate the endoscope | Parotid–submandibular | 3–5 | Main duct–hilum | Open |
| Inability to retrieve the stone | Parotid–submandibular | 4–6 | Main duct | Combined |
