Figure 15c. PLCH in a 30-year-old man with a history of cigarette smoking, recent fatigue, and malaise. The patient worked as a welder and sandblaster and was referred with a clinical and radiographic diagnosis of "miliary tuberculosis." High-resolution CT scans (lung window) show irregular nodules and thick- (a) and thin-walled (b) cysts with relative sparing of the lung bases (c). Note the irregular morphology of some of the cystic lesions.