A 29-year-old woman has painless cervical and mediastinal lymphadenopathy that has progressed over 2 months. She reports drenching night sweats and pruritus but no sore throat, recent travel or cat exposure. Her full blood count is normal, and a lymph-node biopsy demonstrates large atypical cells in an inflammatory background with characteristic bilobed nuclei. Which diagnosis is most likely?
Keep going — a set of ten like this one, one at a time.
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