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Wiskott-Aldrich syndrome

Wiskott-Aldrich syndrome (WAS) is a rare X-linked recessive disease characterized by eczema, thrombocytopenia (low platelet counts), immune deficiency, and bloody diarrhea (due to the low platelet counts). It is also sometimes called the eczema-thrombocytopenia-immunodeficiency syndrome in keeping with Aldrich's original description in 1954. more...

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Signs and symptoms

WAS generally becomes symptomatic in children. Due to its mode of inheritance, the overwhelming majority are male. It is characterised by bruising caused by thrombocytopenia (low platelet counts), small platelet size on blood film, eczema, recurrent infections, and a propensity for autoimmune disorders and malignancies (mainly lymphoma and leukemia).

In Wiskott-Aldrich syndrome, the platelets are small and do not function properly. They are removed by the spleen, which leads to low platelet counts. Also, patients develop a type of itchy rash called eczema. Autoimmune disorders are also found in patients with WAS.

Diagnosis

The diagnosis is made on the basis of clinical parameters, the blood film and low immunoglobulin levels. Skin immunologic testing (allergy testing) may reveal hyposensitivity. It must be remembered that not all patients will have a family history, since they may be the first to harbor the gene mutation. Often, leukemia may initially be suspected on the basis of the low platelets and the infections, and bone marrow biopsy may be performed. Decreased levels of Wiskott-Aldrich syndrome protein and/or confirmation of a causative mutation provides the most definitive diagnosis.

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