Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are within normal limits and without change when allowances are made for accentuation by lower lung volumes on today 's study . Lungs are clear except for linear bibasilar atelectasis . There is no pleural effusion or pneumothorax . No acute , displaced rib fracture is evident on this chest radiograph examination .
    OUTPUT:
    
No evidence of pneumothorax or grossly displaced anterior rib fracture . Conventional chest radiographs are relatively insensitive for detecting anterior rib fractures , and dedicated coned - down rib radiograph at the site of point tenderness could be considered for more complete evaluation if warranted clinically .