Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , pleural effusion or pneumothorax . Heart size is normal . No mediastinal widening . Cortical step - off and acute angulation of the proximal sternal body is consistent with an acute fracture .
    OUTPUT:
    
1 . Acute sternal fracture . 2 . Clear lungs .