Classic Ghon complex in a child infected with Mycobacterium tuberculosis

This radiograph shows a classic Ghon complex in a child infected with Mycobacterium tuberculosis about six months previously, based on results of a contact investigation. There is a calcifed parenchymal lesion and calcification of the regional hilar lymph node. Although a Ghon complex contains live organisms, the number is small (as seen in infection rather than disease), so management with isoniazid alone as for latent infection is sufficient.