慢性髓性白血病伴极端血小板增多症。

The Korean Journal of Hematology Pub Date : 2012-03-01 Epub Date: 2012-03-28 DOI:10.5045/kjh.2012.47.1.7
So Young Kim, You La Jeon, Tae Sung Park
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Chronic myeloid leukemia with extreme thrombocytosis.
which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. A 51-year-old man with no specific medical history was brought to our hospital with general weakness. Complete blood smear showed marked increase in giant platelets and hypogranulated platelets (A). Bone marrow aspirate displayed normal erythropoiesis and increased granulopoiesis, and a notable finding was marked increase in the number of small megakaryocytes, namely, " dwarf megakarytocytes. " However, a few megakaryocytes showed hyperplastic features (B). Essential thrombocythemia (ET) was preferentially considered over other myeloproliferative neoplasms (MPNs). However, both JAK2 V617F and MPL 515 mutations were not detected. Interestingly, the Philadelphia chromosome was detected in 19 out of 20 bone-marrow metaphase cells analyzed. Subsequently, BCR/ABL1 fluorescence in situ hybridization (FISH) analysis yielded a positive result. Reverse transcriptase-polymerase chain reaction (RT-PCR) analysis for BCR/ABL1 rearrangement showed the presence of the b3a2 fusion gene. Finally, the patient was diagnosed with chronic myeloid leukemia (CML) associated with extreme thrombocytosis (C). After one course of imatinib treatment, the patient's platelet count was reduced to normal levels. Although CML is easily predicted by approaches of morphologic basis, cases with extreme thrombocytosis would require molecular techniques such as chromosome, FISH and RT-PCR for a proper differential diagnosis including other disorders of MPN such as ET.
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