An uncommon overlap of two common rheumatological disorders.

Juvenile systemic lupus erythematosus (SLE) is a heterogeneous multisystem autoimmune disease. Kawasaki disease is a common vasculitic disorder in children that manifests with fever and mucocutaneous involvement. While overlap of childhood SLE with other rheumatological disorders has been described, it is extremely unusual in the context of Kawasaki disease. We report two children who had SLE and developed features of Kawasaki disease simultaneously, and the second child had myocarditis which could be a manifestation of Kawasaki disease rather than SLE. Two or more rheumatological diseases may coexist at the same time and one must always be vigilant.