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Hi Mary,
I am very sorry about your father's diagnosis. Sometimes the marrow at biopsy appears empty and it resembles AA. It is not necessary an error in diagnosis, because the marrow is empty and it is identical to an AA marrow. Probably the leukemic cells trigger an immune response which suppresses the normal marrow. As the immunosuppressive treatment is started, the normal marrow comes back, but the leukemic cells surface too, making the diagnosis of AML obvious. Again, it is not necessary a diagnostic error, but rather an atypical presentation for AML. Our doctor made us aware of this possibility.
Dan
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