Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base atelectasis is seen without definite focal consolidation . No pleural effusion or pneumothorax is seen . The cardiac silhouette is mildly enlarged . Mediastinal contours are unremarkable . Degenerative changes are seen along the spine .
    OUTPUT:
    
Left base atelectasis without definite focal consolidation .