1 MCQs in Microbiology for NEET PG
A 24-year-old woman from a high TB-burden country presents with 8 weeks of low-grade evening fever, night sweats, anorexia, and 6 kg weight loss. Chest examination is unremarkable; sputum AFB smear is negative. Contrast-enhanced CT chest shows enlarged right paratracheal, subcarinal, and hilar lymph nodes (largest 28 mm). The structure marked **C** demonstrates central low-attenuation (hypodense) core with peripheral rim enhancement and nodal matting. EBUS-TBNA confirms granulomatous inflammation with caseation and acid-fast bacilli on Ziehl-Neelsen stain. GeneXpert MTB/RIF is positive and rifampicin-sensitive. Which of the following BEST explains the radiological appearance of the structure marked **C**?
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