2 patients with coexistent polycythaemia vera and chronic lymphocytic leukaemia are described. A 61-year-old man presented with an increased packed cell volume (PCV) and a leucoerythroblastic blood picture, which was reversible upon treatment, neutrophil leucoytosis, bone marrow lymphocyte infiltration and splenomegaly, and subsequently developed lymphomas, blood lymphocytosis and thrombocytosis. The second case was a 58-year-old female presenting with increased PCV and leucocyte alkaline phosphatase score. She later had neutrophil leucocytosis, thrombocytosis, lymphocytosis, lymphomas and splenomegaly. These cases, together with 6 cases published by others, suggest that an association exists between the two diseases.
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