Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show increased opacification at the left lung base compared to the right and is likely due to atelectasis in the setting of decreased inspiratory lung volumes . The lungs are otherwise clear without appreciable pulmonary lesions , pleural effusion or pneumothorax . The pulmonary vasculature is not engorged . The cardiomediastinal silhouette is within normal limits and unchanged from multiple priors .
    OUTPUT:
    
Left lower lobe atelectasis most likely in the setting of decreased lung volumes . No evidence of acute or chronic tuberculosis .