Objective:

To describe a pediatric case of hemophagocytic lymphohistiocytosis (HLH) associated with isovaleric acidemia and highlight the critical role of metabolic disorders in HLH presentations, which are often overlooked.

Approach:

Key Findings:

• The patient had concurrent adenovirus and parainfluenza virus infections, complicating the clinical picture.
• A homozygous pathogenic variant in the IVD gene confirmed the diagnosis of isovaleric acidemia, linking metabolic dysfunction to HLH.
• The clinical presentation of HLH was linked to metabolic dysregulation rather than being an isolated hyperinflammatory syndrome, suggesting a need for broader diagnostic considerations.

Interpretation:

The findings suggest that metabolic disorders can amplify immune dysregulation, particularly during infections, indicating that HLH may signal an underlying metabolic or genetic condition requiring specific attention.

Limitations:

• Biochemical confirmation via plasma acylcarnitine profile or urinary organic acid analysis was not performed due to local diagnostic constraints, which may limit the generalizability of the findings.

Conclusion:

The case illustrates the need for heightened awareness of metabolic disorders as potential triggers for HLH, which may lead to more tailored management strategies and improved patient outcomes.

Attribution Notice

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