Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes slightly low . There is no focal consolidation , pleural effusion or pneumothorax . There is mild retrocardiac atelectasis . Imaged upper abdomen is unremarkable . The apperance of the distal left clavicle is stable .
    OUTPUT:
    
Mild retrocardiac atelectasis , otherwise no acute cardiopulmonary process . This study was reviewed with Dr . ___ , ___ radiologist .