Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable cardiomegaly and persistent pulmonary vascular congestion in this patient who is status post previous median sternotomy and mitral valve replacement . A linearly oriented opacity in the left mid lung region appears to correspond to an area of atelectasis or scar on CT chest of ___ . There are no pleural effusions .
    OUTPUT:
    
Cardiomegaly and pulmonary vascular congestion . Bandlike opacity in left mid lung region appears to correspond to a large area of linear atelectasis on recent CT . Radiographic followup would be helpful to ensure resolution .