Which statement best describes chest X-ray findings in tuberculosis?

• A. It will definitively diagnose TB if infiltrates are present.
• B. It never shows cavitary lesions.
• C. It may show upper lobe infiltrates, cavitary infiltrates, or lymph node involvement.
• D. It may show upper lobe infiltrates, cavitary infiltrates, or lymph node involvement but cannot alone diagnose TB.

Answer: (D)

Chest imaging is a useful clue in tuberculosis but not a confirmatory test. Radiographic patterns can include upper lung zone infiltrates, cavitary lesions, or lymph node enlargement, reflecting different stages or forms of TB (reactivation tends to affect the apices with potential cavitation; primary TB often shows node involvement, especially in children). However, these findings are not specific to TB and can occur with other infections or diseases. Because a definitive TB diagnosis requires microbiologic evidence—such as detection of Mycobacterium tuberculosis on culture, acid-fast staining, or a positive nucleic acid amplification test from sputum or other specimens—an X-ray alone cannot confirm TB. Also, imaging can be normal in early disease or altered in immunocompromised patients, underscoring the need for microbiology plus clinical evaluation.