Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and aortic valve replacement . The cardiac , mediastinal and hilar contours appear unchanged . The heart is at the upper limits of normal size . Aside from band - like opacity in the left mid lung suggesting minor atelectasis , there is no focal abnormality , but a mild diffuse interstitial abnormality suggests slight congestion . There is no pleural effusion or pneumothorax . The patient is also status post posterior fusion of the lower thoracic spine and vertebroplasty
    OUTPUT:
    
Findings suggesting mild vascular congestion .