Figure 7c. PLCH in a 41-year-old man with fatigue, malaise, weight loss, and a 50-pack year history of cigarette smoking. (a, b) Posteroanterior (a) and posteroanterior collimated (b) radiographs show subtle bilateral upper lobe nodules with indistinct borders. (c, d) High-resolution CT scans (lung window) of the right (c) and left (d) lungs show multifocal nodules and cysts. The nodules have irregular borders, and the cyst walls have variable thickness ranging from thin and uniform to nodular and irregular.