Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are normal . The lungs are clear without evidence of focal consolidations concerning for pneumonia . A nondisplaced fracture with subtle periosteal reaction is seen laterally involving the left seventh rib . There is no evidence of a pleural effusion or pneumothorax .
    OUTPUT:
    
Acute nondisplaced fracture seen laterally involving the left seventh rib . No evidence of a pneumothorax .