Figure 2a. CT scans and autopsy findings in a 74-year-old man with silicosis (former tunnel worker). (a, b) Transverse spiral CT scans obtained with 10-mm section thickness. (a) Lung window scan shows PMF (arrows) and pleural effusion in both lower lobes, surrounded by multiple small pneumoconiotic nodules. (b) Mediastinal window scan shows a thickened band (large arrow) between PMF and the thickened pleura on the left side. The PMF on the right side is adherent to the pleura, which shows smooth thickening at the site of attachment (small arrows). (c) Gross lung specimen from a coronal section confirms invagination of diffuse thick pleura into the black PMF on the left side (arrow, right side of image). The thickened band in b proved the continuation of thickened pleura. The right pleura also shows diffuse thickening and invagination (arrows, left side of image) into the PMF.