HERSHEY, Pa. — Tom Murphy, a 54-year-old from East Petersburg, was driving home from Myrtle Beach, South Carolina, late last summer when his friend urged him to see a doctor about his persistent cough.
Murphy went to his primary care physician. As she checked his neck, she paused. Suddenly, Murphy recalled something.
“There were times before when I felt like there might be a bump on the left side of my neck, but nothing that really jumped out,” he says. “I thought maybe it was just a muscle.”…