Abstract
Introduction:
Hyper-IgM syndrome is an inborn error of immunity characterized by a defect in immunoglobulin isotype switching, leading to decreased levels of IgG, IgA, and IgE, with normal or elevated IgM concentrations. It predisposes individuals to infectious processes in the respiratory and gastrointestinal systems, as well as autoimmune diseases and neoplasms.
Case Report:
A 5-year-7-month-old male pediatric patient with a history of two episodes of pneumonia (one severe) and chronic diarrhea since the age of two. He presented with persistent moderate neutropenia, decreased IgG levels, and elevated IgM. Flow cytometry confirmed the absence of CD40L. During clinical progression, early liver involvement was observed.
Conclusion:
Hyper-IgM syndrome predisposes patients to liver damage, making comprehensive evaluation and early diagnosis essential. Active anti-infectious treatment and control of the inflammatory response are key factors in managing liver damage in these patients.
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