Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear of opacities concerning for infection . Subtle left lower lobe opacities likely represent areas of atelectasis , which date back to ___ . There is no pleural effusion or pneumothorax . Cardiac size is normal . No frank pulmonary edema . An old left sided rib fracture is reidentified , but no acute fractures are present . Degenerative changes of the left shoulder including subchondral cyst formation date back to ___ .
    OUTPUT:
    
1 ) No evidence of acute cardiopulmonary process . 2 ) No rib fracture is identified on these non-dedicated radiographs . If clinical concern remains , dedicated rib radiographs are recommended .