IL1B and macrophage activation syndrome: Case 2: a previously healthy 10 month-old girl presenting with fever and maculopapular rash, IVIG- non responder, complicating in the subacute phase with MAS manifesting persistent fever, hypertransaminasemia, hyperferritinemia and hypofibrinogenemia after two high doses of IVIG and boluses of MPD; she responded to addiction of IL-1 blocker , anakinra.