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A 72-year-old man presents to your office for follow-up after a recent hospitalization for pneumonia. He is now 6 weeks out and feels well. But while he was in the hospital, he had an increased WBC with lymphocytosis. You repeat his CBC and find a WBC of 18,000/mm3, with 80% lymphocytes, hemoglobin of 14g/dl, and a platelet count of 200,000/mm3. You review office records from a visit 1 year ago and find a WBC of 14,000/mm3 with 76% lymphocytes. You send his peripheral blood for flow cytometry, which is consistent with a diagnosis of chronic lymphocytic leukemia (CLL).