Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal opacities in left lower lung are new . This could only be due to atelectasis ; however , aspiration can also be included in the differential diagnosis in appropriate clinical setting . There is no pleural effusion or pneumothorax . Mediastinal and cardiac contours are normal .
    OUTPUT:
    
Minimal left lower lung opacities are new . This could only be due to atelectasis ; however , aspiration can also be considered in appropriate clinical setting .