[Extramedullary erythropoiesis in the posterior mediastinum: clinical and radiological aspects of the authors' own case (Cooley's disease)].

A case of intrathoracic extramedullary hematopoiesis, during Cooley's disease in a 38 year old male, is analysed, especially from the point of view of its radiological signs. The combination of radiological, clinical and laboratory findings makes the interpretation of the radiographs more precise. The radiologic diagnosis is essential because it makes it possible to avoid biopsy or surgery which can be harmful because of the extreme vascularity of this erythropoietic tissue. This avoids excision of these masses and thus avoids exacerbation the anemia.