Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy . Sternotomy wires are well aligned . Surgical clips overlie the mediastinum and right upper lung field . Allowing for AP projection and rotation , the heart is upper limits of normal . Lung volumes are mildly decreased . Patchy and linear opacities are present at the left lung base . . There is no lobar consolidation , pneumothorax , or pulmonary edema . Mild blunting of the left costophrenic angle may be secondary to pleural thickening or trace pleural effusion .
    OUTPUT:
    
Patchy and linear left basilar opacities favor atelectasis over infectious pneumonia . If clinical suspicion for pneumonia persists , short - term followup radiographs may be helpful . .