Macrophage activation syndrome.

Macrophage Activation Syndrome is a rare and potentially fatal disease, to be considered in patients with a SIRS like clinical presentation. Falling ESR and hyperferritinemia in the appropriate clinical setting can be the greatest clues. We report a case in which a female admitted with fever and rash, initially had systemic inflammatory response syndrome (SIRS) like clinical presentation, but eventually proved to be a rare case of fatal Macrophage Activation Syndrome.