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Extramedullary hematopoiesis in patients with thalassemia anemia.

Abstract A high incidence of thoracic extramedullary hematopoiesis (TEH) was found among patients with thalassemia intermedia. The masses occurred from T2-T11; a few were unilateral in location. The usual clinical course of such patients appears to be related to the physiological requirements for the development of such masses. The pathogenesis of TEH is discussed.