Solve this exciting clinical case specific to your field of interest via Docplexus’ Clinical Case Challenge. Join your fellow doctors to discuss and answer today’s challenge. Case presentation A 17-year-old male football player with a history of cystic fibrosis (CF) visited the clinic with complaints of recurrent muscle cramps while playing football.

These cramps would occur during the second half of the game and two-a-day workouts. It mainly affected his lower extremities and sometimes his abdomen and upper extremities.