Does bone marrow take out for many times how to return a responsibility?

The causes of failure to extract bone marrow by bone marrow puncture may include myelofibrosis, bone marrow necrosis, amyloidosis, granuloma and multiple myeloma. If there is no clear reason for "dry pumping", it is necessary to do bone marrow biopsy to investigate whether it is caused by hypoplasia of bone marrow, hyperplasia of bone marrow fibrous tissue or hyperactive bone cavity due to hyperplasia.

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