Tuberculosis Pathology

A 32-year-old man from rural Maharashtra presents with a 3-month history of cough, fever, and night sweats. Chest X-ray shows cavitary lesions in the right upper lobe. Sputum smear microscopy is positive for acid-fast bacilli. He has no prior TB treatment history and normal renal and hepatic function. What is the drug of choice as the backbone of his initial intensive phase regimen?

A 38-year-old male from rural Maharashtra presents with a 3-month history of productive cough, fever, and weight loss. Chest X-ray shows a cavitary lesion in the right upper lobe with surrounding consolidation. Sputum smear microscopy is positive for acid-fast bacilli (AFB). Histopathology of a transbronchial biopsy specimen shows central caseous necrosis surrounded by epithelioid histiocytes and Langhans giant cells. Which of the following best describes the pathological hallmark seen in this patient?

A 38-year-old man from rural Maharashtra presents with a 3-month history of productive cough, fever, and night sweats. Chest X-ray shows cavitary lesions in the right upper lobe. Sputum smear microscopy is positive for acid-fast bacilli (AFB). He has no prior TB history and no known HIV exposure. What is the most appropriate next step in management?

A 42-year-old woman with biopsy-proven pulmonary TB on standard HRZE therapy for 2 months reports persistent productive cough, fever, and weight loss. Repeat sputum smear microscopy remains positive for AFB. CXR shows no radiological improvement. She reports good adherence to medications. What is the most appropriate next step in management?

A 32-year-old man from rural Maharashtra presents with a 3-month history of productive cough, fever, and night sweats. Chest X-ray shows a cavitary lesion in the right upper lobe with surrounding infiltrates. Sputum smear microscopy is positive for acid-fast bacilli. Histopathology of a transbronchial biopsy specimen shows central caseous necrosis surrounded by epithelioid histiocytes and Langhans giant cells, with an outer rim of lymphocytes and fibroblasts. Which of the following best describes the pathological process occurring in this patient?