Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base atelectasis is seen . There is chronic blunting of the right costophrenic angle . Right - sided rib fixations and chronic rib deformities are re - demonstrated , similar in appearance . No large pleural effusion is seen . No pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Streaky left base opacity is most likely due to atelectasis although infectious process is not excluded in the appropriate clinical setting .