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The frequency of head and neck metastatic tumors at Iran Cancer Institute (1991-2011) with respect to the site of the primary tumor
| Site of the primary tumor | Frequency | % |
|---|---|---|
| Unknown | 4 | 23.6 |
| Breast | 3 | 17.4 |
| Skin (except head and neck area) | 2 | 11.8 |
| Lung | 2 | 11.8 |
| Lung Thyroid gland | 1 | 5.9 |
| Buccal mucosa | 1 | 5.9 |
| Esophageous | 1 | 5.9 |
| Larynx | 1 | 5.9 |
| Ovary | 1 | 5.9 |
| Pancreases | 1 | 5.9 |
| Total | 17 | 100 |
