system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 11-year-old boy came with history of cough for 15 days. On examination he was found to have cervical lymphadenopathy. The lymph node biopsy is shown below. Which of the following is the most appropriate diagnosis?
assistant
The correct answer is  Cavitation occurs only in secondary tuberculosis. Both primary and secondary tuberculosis are characterized bycaseating granulomas, often with Langhans giant cells, which heal by scarring and calcification. The skin test result for tuberculin sensitivity is positive in both forms.