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Familial haemophagocytic lymphohistiocytosis
Haemophagocytic lymphohistiocytosis (HLH) is a rare, but potentially fatal, disease that occurs when normal histiocytes and lymphocytes become overactive and commonly occurs in infancy. Two forms of the disease have been described: primary and secondary. This article reports twins who were less than 2 years old at the time of presentation and who had clinical symptoms of primary (familial) HLH, which was diagnosed by a contributory pathological bone marrow test.