Doctor says treatment and symptoms indicate tumor is not very big. June 6, 2012 — -- It's unlikely that singer Sheryl Crow's meningioma -- a tumor that occurs outside of the brain -- triggered ...

Meningiomas are the most common primary brain tumors, accounting for nearly one-third of all central nervous system (CNS) tumors. While most are benign and manageable, 20–30% progress to high-grade ...