Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle left base opacity may be due to minor atelectasis and overlap of vascular structures early , developing consolidation is not excluded in the appropriate clinical setting , although felt less likely . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Chronic resorption of the distal left clavicle is noted .
    OUTPUT:
    
Subtle left base opacity may be due to minor atelectasis and overlap of vascular structures early , developing consolidation is not excluded in the appropriate clinical setting , although felt less likely .