Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and view of the chest . Left base opacity partially silhouettes the left hemidiaphragm . The lungs are otherwise clear without consolidation or pulmonary vascular congestion . Cardiomediastinal silhouette is stable as are the osseous and soft tissue structures .
    OUTPUT:
    
Left basilar opacity potentially due to atelectasis however in the proper clinical setting pneumonia is also possible .