Fig. 1

Representative CT findings of hospitalized adult patients with PTB. a AFB-negative, CT findings show multiple nodules in the upper lobes of both lungs, and the nodules distributed along the lungs show a "tree bud sign" (arrow); b AFB-negative, multiple patches and nodules in the right middle lobe (arrow); c AFB-positive, large consolidation of the right lung, worm-eaten cavities (arrows) visible inside, scattered nodules in the left lung, and mediastinum shifted to the right