Dr. Ben Carson, of Johns Hopkins, is considered one of the world's best pediatric brain surgeons. He performs over 500 operations a year – triple the average neurosurgeon's caseload. He is recognized for his success with "hopeless cases." Now he has some help. Dr. Carson has obtained a new tool for his brain tumor surgeries – a wand with special sensors at its tip. We watch as a monitor with four different views of the brain tracks the tip as it approaches and removes the life-threatening tumor.