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Extramedullary hematopoiesis refers to hematopoiesis occurring outside of the medulla of the bone. In some cases, it may be physiologic. For example, during fetal development, hematopoiesis occurs at many different locations, such as the liver and spleen. However, it is more frequently associated with pathologic processes. For example, it can be caused by myelofibrosis, after fibrotic changes within the bone marrow "crowd out" hematopoietic cells, causing them to migrate to other sites such as the liver and spleen. It can sometimes be identified via computed tomography. == See also == * Blueberry muffin baby 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Extramedullary hematopoiesis」の詳細全文を読む スポンサード リンク
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