Significance of a migratory versus summating pattern of onset in the differential diagnosis of arthritis in childhood

In the differential diagnosis of arthritis in childhood, what is the significance of a migratory versus summating pattern of onset?

migratory pattern —one joint is subsiding as another becomes inflamed—is seen in rheumatic fever, poststreptococcal arthritis, and gonococcal arthritis. A summating (additive) pattern —adding one inflamed joint to another—is characteristic of JIA.

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