Hemophagocytic lymphohistiocytosis is characterized by uncontrolled activation of the immune system that leads to systemic hyperinflammation. Lymphoproliferative syndrome linked to the X chromosome is a hereditary immunodeficiency characterized by an inability to mount an adequate immune response to an Epstein-Barr virus infection. Hemophagocytic lymphohistiocytosis is one of the main clinical features of X-linked lymphoproliferative syndrome. We report the case of a patient who presented with primary hemophagocytic lymphohistiocytosis associated with Epstein-Barr virus infection without a familial history of immunodeficiency. A mutation in the SH2D1A gene was identified, which confirmed the diagnosis of type 1 X-linked lymphoproliferative syndrome.
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