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Brain
Metastases
Epidemiology of Brain Metastasis
| Primary site | |
| Lung | 50% |
| Breast | 15–20% |
| Other known primary | 10–15% |
| Unknown primary | 10–15% |
| Melanoma | 10% |
| Colon | 5% |
| Relevant facts | |
| Median survival | <1 year |
| Mean age | 60 years |
| Annual U. S. incidence | >170,000 |
| Autopsy incidence | 10–30% |
| Clinical incidence | 15–30% |
| Metastatic/primary ratio | 10:1 |