Football practice was leaving a teen fatigued. A rare cancer was to blame.

Cameron Rider had always been an athlete and loved hockey and baseball. The summer before his junior year of high school, he decided to join the football team. Pre-season practices in August left him fatigued and out of breath, but Rider, 16 at the time, just thought he was getting used to the new sport. As the weeks passed, his symptoms escalated. When his tiredness turned into a 105 degree fever and body aches, his parents took him to a local emergency room. He was diagnosed with pneumonia. Antibiotics helped, but soon his symptoms returned. He spent the next few months repeating the same cycle. In November, he was hospitalized with pneumonia. Steroids and antibiotics couldn't keep the illness at bay. Finally, doctors recommended he see a specialist. Rider was hopeful he might get some answers. "What they were doing beforehand wasn't cutting it ... but I wasn't too worried," Rider said. "I was being told that it was pneumonia, that it was just reoccurring constantly, and there might be a little bit of a blockage or something else that might be going on." Rider underwent a bronchoscopy, an exploratory procedure where a camera is inserted down the throat to study a person's lungs and airways. It was meant to be a routine, 15-minute process. Then doctors spotted a mass. The bronchoscopy turned into a two-hour procedure so his care team could remove part of the mass and send it out for testing. …