Extramedullary hematopoiesis most commonly occurs in which two organs?

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Multiple Choice

Extramedullary hematopoiesis most commonly occurs in which two organs?

Extramedullary hematopoiesis is the production of blood cells outside the bone marrow, typically reactivated in organs that retain fetal hematopoietic activity. The liver and spleen are the classic sites because they are capable of supporting hematopoiesis from development and can resume this function when the marrow cannot meet demand (as in marrow failure or severe/chronic anemia). This reactivation leads to hepatosplenomegaly as these organs take on hematopoietic work. The brain and spinal cord, heart and lungs, and kidneys/adrenals do not normally support hematopoiesis in adults, so they are not typical sites for this process.

Extramedullary hematopoiesis is the production of blood cells outside the bone marrow, typically reactivated in organs that retain fetal hematopoietic activity. The liver and spleen are the classic sites because they are capable of supporting hematopoiesis from development and can resume this function when the marrow cannot meet demand (as in marrow failure or severe/chronic anemia). This reactivation leads to hepatosplenomegaly as these organs take on hematopoietic work. The brain and spinal cord, heart and lungs, and kidneys/adrenals do not normally support hematopoiesis in adults, so they are not typical sites for this process.

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