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Hyper-IgM syndrome complicated with interstitial pneumonia and peritonitis
Chun-Fong Huang1, Chih-Lu Wang, Yung-Feng Huang
1Department of Pediatrics, Veterans General Hospital, Kaohsiung, Taiwan, ROC.
Chang Gung Medical Journal
|March 27, 2003
Summary
Hyper-IgM syndrome (HIM), a rare CD40 ligand deficiency, can manifest with severe complications like interstitial pneumonia and peritonitis. This case highlights intestinal lymphoproliferation as a potential cause of peritonitis in HIM patients.
Area of Science:
- Immunology
- Genetics
- Gastroenterology
Background:
- Hyper-IgM syndrome (HIM) is a rare primary immunodeficiency characterized by defective CD40 ligand (CD40L) expression.
- Patients typically present with normal/elevated IgM and low IgG, IgA, IgE, stemming from mutations in the CD40L gene.
- This case involved a patient with confirmed CD40L deficiency via flow cytometry.
Observation:
- The patient initially presented with symptoms suggestive of Pneumocystis carinii pneumonia (interstitial pneumonia).
- Treatment with intravenous immunoglobulin and trimethoprim-sulfamethoxazole led to pulmonary improvement.
- Subsequently, the patient developed peritonitis, necessitating surgical intervention.
Findings:
- Pathologic examination revealed ileum perforation and intestinal lymphoproliferation.
- These findings suggest a link between intestinal lymphoproliferation and peritonitis in this HIM case.
- Peritonitis is an exceptionally rare complication in Hyper-IgM syndrome.
Implications:
- This case expands the known clinical spectrum of Hyper-IgM syndrome.
- It suggests that intestinal lymphoproliferation leading to peritonitis should be considered in HIM patients with abdominal complications.
- Further research may elucidate the mechanisms underlying gastrointestinal manifestations in CD40L deficiency.