<prompt> Most common origin of cerebral metastases isColonKidneyMalanomaLung  <response>: Metastatic Brain Tumors Metastatic brain tumors are the most common tumors of the brain They out number primary brain tumors by 10 to 1 Location: Cerebral hemispheres 80 mainly the frontal lobes, cerebellum 15 and brain stem 5 Most common primary sites : CA Lung 50 breast cancer15-20 Metastasis to brain are multiple in 70 of cases Ref: Harrisons 19th edition Pgno :1604 