[Macrophage activation syndrome associated with adult-onset Still's disease]

Area of Science:

• Rheumatology and Immunology
• Internal Medicine
• Pathophysiology

Background:

• Macrophage activation syndrome (MAS) is a severe, life-threatening condition characterized by uncontrolled immune cell activation.
• Adult-onset Still's disease (AOSD) is an inflammatory disorder that shares clinical and laboratory similarities with MAS.
• Differentiating between MAS and AOSD can be challenging due to overlapping symptoms and the potential for AOSD to induce MAS.

Purpose of the Study:

• To explore the complex relationship between Adult-onset Still's disease (AOSD) and Macrophage activation syndrome (MAS).
• To highlight the diagnostic difficulties in distinguishing between AOSD and reactive MAS.
• To identify potential triggers for MAS in the context of AOSD treatment and management.

Main Methods:

• Review of clinical presentations and laboratory data in patients with AOSD and MAS.
• Analysis of potential etiological factors contributing to MAS development in AOSD patients.
• Discussion of diagnostic challenges and therapeutic considerations.

Main Results:

• AOSD symptoms and laboratory findings can closely mimic reactive MAS, complicating differential diagnosis.
• AOSD can independently trigger MAS, further increasing diagnostic complexity.
• Treatment-induced immunosuppression in AOSD may lead to latent viral reactivation (e.g., Epstein-Barr virus), precipitating MAS.
• Certain AOSD therapeutic agents, like sulfasalazine, can provoke reactive MAS.

Conclusions:

• Distinguishing between AOSD and MAS is clinically challenging due to overlapping features and the potential for AOSD to induce MAS.
• Multiple factors, including viral reactivation and therapeutic agents, contribute to MAS development in AOSD.
• Effective therapy requires identifying and targeting the primary cause of MAS in affected individuals.