These 3 radiographs showed pulmonary granulomas. The first 2 are uncalcified while the 3rd is calcified. The location of the first one corresponds to the Ghon's focus of primary tuberculosis. The 2nd is located in the right upper zone - a common site for post-primary TB. Note the adjacent vascular shadow, Could the nodule be actually end-on vessel?
Granulomas may be present anywhere but the mid zone laterally and upper zones are the common sites. It may be calcified or may not. They resulted from healing of previous tuberculous foci and usually contain dormant bacilli. When the body goes under stress, the bacilli can become active again. This will result in post-primary tuberculous infection.