Fever, Neck Stiffness, and Leg Pain in a 6-year-old Boy

A 6-year-old boy with bicuspid aortic valve, coarctation of the aorta repaired in infancy, and atrial septal defect (ASD), status post device closure 6 months ago, is admitted to the general pediatric inpatient service. Three days ago he developed bilateral diffuse leg pain, persistent fever, and decreased oral intake. On the day of presentation he awoke with headache, neck stiffness, back pain, and pain on weight bearing.On review of his...