A broncholith, a calcified peribronchial lymph node that erodes into an adjacent bronchus, is most often the consequence of Histoplasma or tuberculous infection. The imaging appearance is of a small calcific focus in or immediately adjacent to an airway, most frequently the right middle lobe bronchus. Broncholiths are readily identified on CT scans. Distal obstructive changes may include atelectasis, mucoid impaction, and bronchiectasis [from
HPO]