Dr. Mohammed Iqbal watches a monitor in a control room behind the operating room at Dell Children's Medical Center. An image of a brain lights up with green, yellow and blue areas to denote that ...

Mark Strand, 68, knew something was wrong when he went in for testing. “I was having daily fevers and low-level fevers,” Strand said. “And the PET scan revealed, in the end, a mass on top of my head.” ...