Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is mild vascular congestion with peribronchiolar wall thickening . No obvious pleural effusion . No pneumothorax . The heart is probably mildly enlarged despite low lung volumes and AP projection . The patient is status post median sternotomy . Surgical clips project over the mediastinum . No acute osseous abnormality .
    OUTPUT:
    
There is mild vascular congestion . Faint peribronchial opacities could represent atypical infection .