Cellular War: The Dominance Struggle of Polycythemia Vera and Chronic Lymphocytic Leukemia Clones Within a Patient.

Background: Polycythemia vera (PV) and chronic lymphocytic leukemia (CLL) are distinct hematological malignancies. While their coexistence is rare, it poses unique diagnostic and therapeutic challenges.

Methods: A 50-year-old male patient presented with elevated hemoglobin levels and a marked lymphocytosis.