1.Definition A.Nomenclature 。Benign tumors are not Benign Malignant(Cancer） cancer and are rarely a threat to life. They can often be removed They do not come back They do not spread to other parts of the body Malignant tumors are cancer. invade neighboring tissues - Cells are abnormal and divide without control or order enter bloodstream and metastasize to different sites They metastasize• Benign tumors are not cancer and are rarely a threat to life. – They can often be removed – They do not come back – They do not spread to other parts of the body • Malignant tumors are cancer. – Cells are abnormal and divide without control or order – They metastasize 1. Definition A. Nomenclature