[X-linked agammaglobulinemia (XLA) associated with agranulocytosis--case report].

: In this case study authors presented the clinical characteristics of X-linked agammaglobulinemia (XLA) associated with agranulocytosis diagnosed in a 2-year-old boy. Affected child lacked circulating mature B cells, presented low levels of serum immunoglobulins, but did not suffer from recurrent bacterial infections. XLA is a primary immunodeficiency caused by a defective tyrosine kinase (Btk) in B cells. Our patient and his mother have a mutation in the BTK gene, described as W281X. During therapy with intravenous gammaglobulin, the boy has not experienced agranulocytosis. It is important to consider a primary immunodeficiency diagnosis when a child presents agranulocytosis or neutropenia and a recurrent infectious disease.