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Change in stage based on FDG-PET.
| Stage change | Reason |
|---|---|
| Upstage | |
| 1. Stage I → III | Axillary, inguinal lymph nodes detected |
| 2. Stage II → IV | Nasopharynx, tonsil lesions detected |
| Downstage | |
| 1. Stage IV → III | Lung lesions not detected by FDG-PET |
| 2. Stage IV → III | Lung lesions not detected by FDG-PET |
| 3. Stage III → 0 | No FDG uptake in neoplastic lesions |
FDG-PET, 18F-fluorodeoxyglucose positron emission tomography.
