Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is increased opacity at the left lung base on the frontal view with sublte increased opacity over the lower spine on the lateral view . There is no large effusion or pulmonary vascular congestion . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Increased opacity at the left lung base , potentially atelectasis . Repeat suggested to ensure resolution and if it persists , CT scan should be performed .