Figure 18a. Paraquat poisoning in a 19-year-old man. Initial chest radiography showed peripheral areas of consolidation and ground-glass opacity in both lungs. (a) Follow-up chest radiograph obtained on the 30th day of hospitalization shows diffuse reticular opacities in both lungs with decreased lung volume. Note the pneumomediastinum and subcutaneous emphysema. (b) Initial high-resolution CT scan shows areas of ground-glass attenuation and consolidation predominantly involving the peripheral lungs. (c) High-resolution CT scan obtained on the 39th day of hospitalization shows reticular hyperattenuating areas, small cysts, and traction bronchiectasis corresponding to the affected areas in b, indicating progression to interstitial fibrosis. (Fig 18a-c courtesy of Mi Jeong Shin, MD, Wallace Memorial Baptist Hospital, Pusan, Korea.)