Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . This accentuates the size of the cardiac silhouette which appears mildly enlarged . The mediastinal and hilar contours are unchanged . There is crowding of bronchovascular structures with possible mild pulmonary vascular congestion . Left upper lobe lobulated mass is not substantially changed in the interval . Patchy opacities in the lung bases likely reflect areas of atelectasis in the setting of low lung volumes . No pleural effusion or pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
1 . Low lung volumes with possible mild pulmonary vascular congestion and patchy opacities in lung bases , likely atelectasis . Please note that infection can not be completely excluded . 2 . Unchanged appearance of left upper lobe lobulated mass , better assessed on the recent chest CT .