Juvenile myelomonocytic leukemia with t(3;5)(q25;q35), Auer rods and marked myelodysplasia

We present a 2-year-old boy with splenomegaly, leukocytosis, thrombocytopenia, anemia, and excess myeloblasts with easily seen Auer rods, and marked dysgranulopoiesis and dyserythropoiesis. Conventional cytogenetic analysis showed a sole abnormality of t(3;5)(q25;q35). Microarray analysis showed a terminal 21 Mb region of copy-neutral loss of heterozygosity on 19q. Disease-related somatic NRAS mutation was detected. This case represents an unusual JMML with Auer rods and marked myelodysplasia. These unusual histopathologic features may be related to the t(3;5)(q25;q35). A t(3;5) with variable breakpoints has been reported in a small proportion of acute myeloid leukemias and myelodysplastic syndromes. To our knowledge, this is the first JMML case reported with this translocation.
Source: Pathology Research and Practice - Category: Pathology Source Type: research

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