Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild subsegmental atelectasis is present at the left base . The aorta is tortuous . There is no focal consolidation , pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Mild subsegmental atelectasis at the left lung base , otherwise normal chest radiographs .