Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires and multiple mediastinal clips are again seen . There is an unchanged overall appearance of opacity at the left lung base which has been previously characterized on CT as rounded atelectasis with loculated small left effusion . Allowing for slight differences in technique , no significant change . There is no pneumothorax . There is no right pleural effusion . The cardiomediastinal silhouette is unchanged . There is stable calcification of the thoracic aorta . There is stable mild DJD and kyphosis of the thoracic spine . Again noted is a compression deformity of an upper lumbar vertebral body without interval change .
    OUTPUT:
    
No change in left basal opacity which likely represents known area of rounded atelectasis in the left lower lobe with loculated small left effusion .