Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are grossly clear without evidence of focal consolidation . There is no pleural effusion , pneumonia , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is irregularity of the left eighth posterolateral rib .
    OUTPUT:
    
Acute left posterior eighth rib fracture . No pneumothorax .