Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . No prior . Exam is limited secondary to patient 's low lung volumes . There are multiple posterior left rib fractures involving the posterior third through at least seventh ribs . There is no definite pneumothorax identified . Cardiomediastinal silhouette is grossly within normal limits for technique and low inspiratory effort .
    OUTPUT:
    
Limited exam due to technique and poor inspiratory effort . Multiple posterior left rib fractures without visualized pneumothorax .