Evan Hines played the piano for the young patients at Sutter Medical Center, Sacramento Children’s Center. It’s the 15-year-old’s way of giving back after his own medical scare. One day Evan, who started playing piano when he was 5, just couldn’t remember how. He was admitted to the hospital and diagnosed with varicella encephalitis, an infection or swelling of the brain. “It's really only something that we see in people that have an immune problem,” said doctor Emy Daniel at the Sutter Medical Center, Sacramento Children’s Center.