Brain What Is The Difference Between Metastasized Brain Cancer And Cancer That Started In The Brain?

What is the difference between metastasized brain cancer and cancer that started in the brain? - brain

My mother had lung cancer a year ago and although she is back, now she has a brain tumor the size of a penny. It is .... What is cancer prognosis and what is the difference between this type of brain cancer (where it originated in the lung) and cancer of the brain that originiates in the brain. So what is the prognosis?