Scarlet fever
Kawasaki Disease
Viral or other forms of cardiomyopathy
Leukemia
Vasculitis (HSP, drug reaction)<unk> 
Developmental dysplasia of hip
Femur fracture
Juvenile idiopathic arthritis
Legg-Calve-Perthes disease
Septic arthritis of the hip (peds)
Lyme disease arthritis
Slipped capital femoral epiphysis
Transient (toxic) synovitis
Osteosarcoma
Lyme disease arthritis
Fibromyalgia
Juvenile idiopathic arthritis
Lyme disease
Osteoarthritis
Psoriatic arthritis
Reactive poststreptococcal arthritis
Rheumatoid arthritis<unk>  fever
Serum sickness
Systemic lupus erythematosus
Serum sickness–like reactions
Viral arthritis
Acute rheumatic fever
Scarlet fever
Kawasaki disease
Kawasaki Disease
Mitral regurgitation
Viral or other forms of cardiomyopathy
Lyme disease
Leukemia