Category Disease Features Infection After empyema * Most often basolateral * May have calcification * Non-progressive After tuberculosis * Commonly forming an apical<unk>  cap * Non-progressive * Rarely extensive, with sheet-like calcifications Active infection with mycobacteria other than tuberculosis, or chronic pulmonary aspergillosis * Slowly progressive * Apical distribution * Cavitations Non-infectious inflammation Asbestosis *<unk>  plaques (see section below) * Less common: Extensive confluent<unk> , sometimes with<unk>  effusion After pleurodesis * Diffuse * Non-progressive After hemothorax * Usually basolateral distribution * May have calcification * Non-progressive After drugs, such as methysergide or bromocriptine * Diffuse * Possible interstitial pulmonary fibrosis Cancer-related Primary cancer, mainly mesothelioma * Associated with asbestosis * Progressive<unk>  Metastasis or invasion, mainly from lung cancer * Progressive * Nodular changes * Lung tumors
Pleural thickening
Subcutaneous emphysema
Pulmonary consolidation
Ground-glass opacity
Tracheobronchomegaly
Notching of the ribs
Pulmonary infiltrate
Subpulmonic effusion