Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low leading to crowding of the bronchovascular structures . No appreciable pleural effusion or pneumothorax is identified . Mild cardiomegaly may be projectional an due to low lung volumes .
    OUTPUT:
    
No definite pneumonia , but assessment of lung bases is limited by low lung volumes . If clinical symptoms persist , a repeat radiograph could be performed .