Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Mild linear density in the lower lungs left greater than right likely reflect atelectasis , difficult to exclude an early pneumonia . No large effusion or pneumothorax . No evidence of edema or pneumonia . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Lower lung atelectasis with possible early pneumonia at the left lung base .