Almost 10% of brain metastases are asymptomatic even with positive findings in CAT or MNR. Some characteristics can help to establish the origin of the tumor, for instance bleeding is common in metastases from melanoma.
The 5-year cumulative incidence of CNS metastases is:
16% Lung cáncer
10% Renal cell cáncer
5% Breast cáncer
1% Colorectal cáncer