A primary brain tumor is a mass created by the growth or uncontrolled proliferation of cells in the brain.
Reviewed last on: 6/10/2008
James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.