Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate blunting of the left costophrenic angle which may be a function of atelectasis or a small pleural effusion . No definite rib fracture is identified . The lungs are otherwise clear , and the cardiomediastinal contours are within normal limits . No pneumothorax is seen .
    OUTPUT:
    
Left basilar atelectasis and possible minimal left pleural effusion with no clear evidence of rib fracture . If clinical concern persists , recommend dedicated rib series for evaluation of rib fracture . No pneumothorax . If clinical findings are progressing , correlation with cross sectional imaging is recommended .