A 43-year–old man with a 6-month history of cough, dyspnea, nocturnal sweats, and weight loss was reviewed in the clinic. Clinical examination revealed cervical lymphadenopathy and indicated constrictive physiology. Initial tests, including chest radiography, sputum examination, QuantiFERON-TB Gold test, and lymph node biopsy, were unyielding. HIV serology was nonreactive
