[Leukemia, lymphogranulomatosis and histiocytosis of Langerhans in children with a history of enlarged thymus gland].

The group consisted of 1056 children with enlarged thymus and a monitored catamnesis in 317 of 0.5-23 years. In 5 examinations in different periods after the diagnosis of enlarged thymus, haematological malignancies were diagnosed: acute lymphoblastic leukaemia (2 children), lymphogranulomatosis (1 child), chronic myeloid leukaemia (monocytic variant) and histiocytosis of Langerhans (1 child). The comparison of these data with other publications on the prevalence of these diseases in the population and the rate of mortality in Moscow place the children with enlarged thymus to high-risk group for haematological malignancies.