There are certainly definitions provided for "aCML", but there is still controversy about its existence as a disease.  A key phrase in the definition you provided is "similar to chronic myelogenous leukemia (CML)".  Also, the "10-20% of immature granulocytes" means that blasts (immature WBCs) are 10-15% of the WBCs.  I would ask the Onc if you actually had 10-15% blasts at diagnosis, and if you did, I could understand why they would apply the "aCML" label because they could not classify you otherwise.  Also, was your red blood cell count low at diagnosis (possibly refractory anemia).  I know that your blog says you had moderately elevated WBC count.  Again, my inputs are only meant to help you ensure a proper diagnosis.  From my discussions with those who were told they had aCML, it was usually a cop-out by the Onc because they were stumped and could not provide an accurate diagnosis.  But the good news is that Revlimid is helping with the -5q issue.

"Myelodysplastic syndrome associated with an isolated del(5q) chromosome abnormality: There are too few red blood cells in the blood and the patient has anemia. Less than 5% of the cells in the bone marrow and blood are blasts. There is a specific change in the chromosome."

http://www.nci.nih.gov/cancertopics/pdq/treatment/myelodysplastic/patient/

http://tampabay.bizjournals.com/tampabay/stories/2005/12/26/daily27.html