Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low leading to crowding of the bronchovascular structures . Despite this , there is subtle increase in airspace opacity at the right lung base which may reflect patchy atelectasis although an early infiltrate can not be excluded . No pleural effusion or pneumothorax . Mild cardiomegaly is noted and may be secondary to AP projection .
    OUTPUT:
    
Mildly low lung volumes with subtle airspace opacity noted at the right lung base . Findings may be secondary to atelectasis in the setting of decreased lung volumes , but aspiration / early pneumonia can not be excluded .