Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates well expanded lungs with bibasilar atelectasis . No focal opacity . Mild prominence of the left hilum is stable from previous examinations . No pleural effusion or pneumothorax . Stable mild cardiomegaly . Mediastinal contour and hila are otherwise unremarkable . Left mid lung laterally pleural based density is unchanged since ___ . Tortuous aorta again noted . Limited assessment of the osseous structures demonstrate right - sided dextroscoliosis as well as kyphosis of the thoracic spine . Visualized upper abdomen is within normal limits .
    OUTPUT:
    
1 . Stable chest . No evidence of pneumonia or pulmonary edema . 2 . Left mid lung laterally pleural based density is unchanged since ___ , suggesting benign etiology .