Mycobacterium tuberculosis on a Kinyoun stain.

A: A chest radiograph from a child with early pulmonary tuberculosis demonstrating hilar adenopathy and perihilar infiltrate. B: An adolescent with severe bilateral upper lobe tuberculosis, with cavitation on the right side.

Source: Kline MW. Rudolph's Pediatrics, 23rd ed. New York, NY: McGraw-Hill Education; 2018.