Juvenile idiopathic arthritis. Subgroup characteristics and comparisons between rheumatoid arthritis-like subgroups and ankylosing spondylitis-like subgroups.

In terms of adult-onset definitions, rheumatoid arthritis (RA) and ankylosing spondylitis (AS) are rarely diagnosed in children. Adult RA is in most aspects similar to seropositive polyarticular arthritis in children, but AS differs in its clinical presentation according to age at onset. In general, the nomenclature and classifications of arthritis in… CONTINUE READING