React* TB on chest X-ray tends to show lesions in which region?

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Multiple Choice

React* TB on chest X-ray tends to show lesions in which region?

Explanation:
Reactivation TB tends to involve areas with high oxygen tension, which are the apical and posterior parts of the upper lobes. On chest X-ray this appears as lesions predominantly in the upper lobes, often cavitating, reflecting bacillary growth in those well-oxygenated regions. Lower or middle lobe involvement is more typical of primary TB, and a pattern that is equal between apex and base is not characteristic of reactivation.

Reactivation TB tends to involve areas with high oxygen tension, which are the apical and posterior parts of the upper lobes. On chest X-ray this appears as lesions predominantly in the upper lobes, often cavitating, reflecting bacillary growth in those well-oxygenated regions. Lower or middle lobe involvement is more typical of primary TB, and a pattern that is equal between apex and base is not characteristic of reactivation.

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