JAK2-positive Philadelphia-negative myeloproliferative neoplasms.

The recent discovery of the JAK2 mutations has rekindled interest in the approach to classic BCR/ABL-negative myeloproliferative neoplasms (MPNs) in terms of both diagnostic evaluation and treatment. However, additional clinical, laboratory and histological parameters play a key role to allow diagnosis and subclassification, regardless of whether JAK2 V617F mutation is present or not. Here are two cases which incidentally presented with splenomegaly and moderate leukocytosis, and were diagnosed as MPN-primary myelofibrosis (PMF) in prefibrotic phase and polycythemia vera (PV), respectively, using revised World Health Organization (WHO) 2008 criteria.

Childhood acute erythtoleukemia diagnosis by flow cytometry.

Acute erythroid leukemia in children is very. Here is a case of erythroleukemia in a child of a age 1.5 years, which was diagnosed on peripheral smear, bone marrow examination, cytochemistry but was confimed on immunophenotyping. CD45 versus side scatter demonstrated blast population (29%) expressing CD45 of variable intensity (dim to negative). The myeloid nature of blast population showed bright expression of CD13, CD33. These blasts also showed bright positivity of CD71 which showed erythroid nature of blasts. Flow cytometry can be comprehensive enough to completely subtype cases of leukemias/myelodysplastic syndromes, polycythemia rubra vera, non-neoplastic conditions like reactive erythroid hyperplasia following immunosuppressive therapy or viral infections or nutritional deficiencies, unlyzed RBCs or thrombocytosis which may mimic acute erythroid leukemia on flow cytometry.