This is the biopsy of a supraclavicular lymph node in a patient with unexplained fever, weight loss, and night sweats. The serum LDH is up. You note these malignant B cells with prominent nuclei and basophilic cytoplasm. The nuclei are mostly round with vesicular chromatin and nucleoli apposed to the nuclear membrane.
Challenge: What is it?
*Note: The next case is related to this one.
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