Why is the splenomegaly in myelofibrosis and not in aplastic anemia?

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medlife2017

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The title says it all. Thanks in advance! (primary myelofibrosis)

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In myelofibrosis the body shifts hematopoeisis to the spleen, since there isn't enough space in the marrow cavity. In aplastic anemia, the reason behind reduced hematopoeisis is a reduction in stem cells. No stem cells means low hematopoeisis in the bone marrow as well as extramedullary tissues such as the spleen.
 
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