A 30-year-old man is evaluated for persistent cough, night sweats, low-grade fever, and general malaise. A chest X-ray reveals findings "consistent with a Ghon complex." Sputum cultures grow acid-fast bacilli. Examination of hilar lymph nodes in this patient would most likely demonstrate which of the following pathologic changes?
Caseous necrosis Coagulative necrosis Fat necrosis Fibrinoid necrosis