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Ataxia-telangiectasia patients presenting with hyper-IgM syndrome
J G Noordzij1, N M Wulffraat, A Haraldsson
1Department of Paediatrics, Reinier de Graaf Gasthuis, Delft, The Netherlands. j.noordzij@rdgg.nl
Archives of Disease in Childhood
|February 20, 2009
Summary
Ataxia-telangiectasia (A-T) can mimic Hyper IgM Syndrome (HIGM) due to similar immunoglobulin levels. Early diagnosis requires considering DNA repair disorders in patients presenting with HIGM-like symptoms.
Area of Science:
- Immunology
- Neurology
- Genetics
Background:
- Ataxia-telangiectasia (A-T) presents with neurological issues, telangiectasias, and immunodeficiency.
- A subset of A-T patients exhibit immunoglobulin levels resembling Hyper IgM Syndrome (HIGM).
- Early-onset A-T may lack typical ataxia and telangiectasias, leading to misdiagnosis as HIGM.
Purpose of the Study:
- To describe eight A-T patients misdiagnosed as HIGM.
- To highlight key diagnostic differences between A-T and HIGM.
- To propose improved diagnostic criteria for differentiating A-T from HIGM.
Main Methods:
- Clinical case series description.
- Analysis of serum immunoglobulin levels (IgG, IgA, IgM).
- Assessment of T lymphocyte counts and alpha-fetoprotein levels.
Main Results:
- Eight patients with A-T presented with HIGM-like serum immunoglobulin profiles.
- These patients exhibited decreased T lymphocyte counts, atypical for HIGM.
- Elevated alpha-fetoprotein levels confirmed the A-T diagnosis in all cases.
Conclusions:
- A-T can be misdiagnosed as HIGM due to overlapping immunoglobulin patterns.
- T lymphocyte counts and alpha-fetoprotein levels are crucial for distinguishing A-T.
- DNA repair disorders should be considered in the differential diagnosis of HIGM.
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