Figure 17a. Berylliosis in a 49-year-old man who worked for 7 years in metal polishing. (a) Chest radiograph shows bilateral mediastinal and hilar lymph node enlargement, as well as internal fixation of a right clavicular fracture. (b, c) Axial thin-section CT scans (1.0-mm-thick-sections) obtained at the levels of the bronchus intermedius (b) and the basal segmental bronchus (c) show multiple small nodules along the bronchovascular bundles (straight arrows) and in subfissural regions (arrowheads) and enlarged hilar lymph nodes (curved arrows). (d) Photomicrograph (original magnification, x100; hematoxylin-eosin stain) of a pathologic specimen obtained with mediastinoscopic lymph node biopsy shows multiple noncaseating granulomas (arrows).