Features of polycythemia vera in the 8p12 myeloproliferative syndrome.

The 8p12 myeloproliferative syndrome is a distinct myeloid disorder associated with a translocation involving chromosome region 8p12 (HUGO nomenclature). It is characterized by leukocytosis, eosinophilia, and a concurrent or rapid transformation to a T-cell lymphoblastic lymphoma. We report a case of polycythemia vera as a clinical presentation of the 8p12 myeloproliferative syndrome and review the literature. Atypical features in patients with polycythemia vera should be investigated with cytogenetic evaluation.