About a dozen student athletes have experienced heart inflammation after being diagnosed with the disease. The NCAA’s chief medical officer discussed the cases of myocarditis, a heart condition that can cause sudden death in young athletes, at a briefing last week. His remarks came two days after the Big Ten and Pac-12 announced they would postpone fall sports. Angelica LaVito reports that the new complication is casting a shadow over college athletics, and creating questions about what the disease does to young people.