Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased opacity at the left lung base . There is linear atelectasis at the right midlung zone . The cardiomediastinal silhouette and hilar contours are stable . There is no pleural effusion or pneumothorax . The aorta is tortuous .
    OUTPUT:
    
Increased opacity at the left lung base , which may be due to atelectasis , however a developing consolidation can not be excluded in the appropriate clinical setting .