Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable upright AP image of the chest demonstrates low lung volumes . No focal consolidation is identified . Bronchovascular crowding is seen with mild congestion . Heart size is enlarged . Mediastinal and hilar contours are within normal limits . The patient is status post median sternotomy . Note is made of several broken sternotomy wires . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No acute intrathoracic abnormality . Low lung volumes with bronchovascular congestion .