<prompt> Extensive pleural thickening and especially involving the diaphragmatic pleura are classical feature ofCoal workers pneumoconiosisAsbestosisSilicosisSiderosis  <response>: Asbestosis 263-CMDT- 08 1612-14-H17thASBESTOSIS - is a nodular interstitial fibrosis occuring in asbestos workers and miners is characterized by a in exorably progressive dyspnea, inspiratory crackers and in some cases clubbing and cyanosis Radiographic features - include interstitial fibrosis, thickened pleura and calcified plaque pleural on the diaphragm or lateral chest wall HRCT is the best imaging method Cigarette smoking in asbestos workers increases the incidence of lung carcinoma PFT shows - restrictive dysfunction and diffusing capacity 