European LeukemiaNet Study on the Reproducibility of Bone Marrow Features in Masked Polycythemia Vera

A panel of six hematopathologists was brought together to assess consensus and interobserver agreement regarding characterization and reproducibility of bone marrow histologic features used to diagnose early stage myeloproliferative neoplasms, in particular differentiation of so-called masked/prodromal polycythemia vera from JAK2-mutated essential thrombocythemia.