The CXR shows a small left pleural effusion with blunting of the left costophrenic angle. The left hemithorax is smaller than the right. The mediastinum is also widened due to tumor creeping along the pleura. All these are features of malignant mesothelioma, which is a primary malignancy of the pleura and typically spreads along the pleura as demonstrated on CT (Fig. 42.2).
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