Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal contours are normal . There is hypoaeration of the left lung , with a dense opacity in the retrocardiac left lung base , concerning for atelectasis versus lung contusion . Multiple left - sided rib fractures are seen with overlying minimal chest wall / subcutaneous gas . Known small left pneumothorax is not well visualized in the current study . Small left pleural effusion is present . The right lung is well expanded and clear . A dextroconvex scoliosis of the thoracic spine is noted .
    OUTPUT:
    
Extensive left sided rib fractures , with a small left pleural effusion and left basal consolidation . Please see concurrent CT torso for further evaluation .