Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear , without focal consolidations to suggest pneumonia . There is slight deviation of the trachea towards the right secondary to a tortuous aorta . There is no pleural effusion or pneumothorax . Cardiac silhouette and mediastinum are stable . Flat diaphragms and increased AP diameter of the chest is consistent with known diagnosis of COPD . The previously mentioned left pulmonary nodular opacity is not seen on this study .
    OUTPUT:
    
No evidence acute cardiopulmonary process . Although a nodular opacity is not appreciated on this study in the left upper lobe , a nodule is not excluded ; please see prior follow - up recommendations .