A 66-year-old woman sees her physician because of a lump on the right side of the neck that has been increasing in size for the past 7 months. On physical examination, the physician palpates a firm but nontender 3-cm mass in the posterior cervical lymph node. Microscopic examination of a biopsy specimen of the mass shows effacement of the nodal architecture by a monomorphous population of large cells with large, dark blue nuclei and scant cytoplasm. The peripheral blood smear and bone marrow biopsy results are normal. Which of the following is the most likely diagnosis?
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