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1 From the Department of Radiology, Strong Memorial Hospital, Rochester, New York
1. A definite roentgenographic diagnosis of thoracic extramedullary hematopoiesis can be made if the patient has:
(a) a lobulated or rounded soft tissue density in the posterior mediastinum without rib erosion,
(b) roentgen changes in the bones of chronic hemolytic anemia or myelofibrosis,
(c) an enlarged spleen or a history of splenectomy, and
(d) a history of chronic anemia.
2. Extramedullary hematopoietic tissue may compress the spinal cord. Radiation therapy is effective.
3. A notched appearance of the expanded ribs seen only in patients with thalassemia is described.
4. Possibly peripelvic extramedullary hematopoietic tissue may mimic renal fibrolipomatosis.
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