Most MDS is hypercellular (too many cells) but 10% to 20% of the time MDS is hypocellular (too few cells).
When MDS is hypocellular it can be hard to distinguish from AA since there aren't many cells to examine. That's one possible explanation for the uncertainty over your diagnosis. ATG (commonly used to treat AA) has been found to be more effective for hypocellular MDS than for hypercellular MDS. That's why it's important for you to get to the most experienced doctors you can find and get a precise diagnosis.
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