Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal . Low lung volumes accentuate bronchovascular structures . No focal areas of consolidation are present within the lungs , there is no pneumothorax or pleural effusion . Two contoured deformities are observed at the left third rib posteriorly and anteriorly , and could be due to acute or old injury . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Abnormalities of left third posterior and anterior rib , which could be due to acute or old injury . If warranted clinically , dedicated rib films could be considered . There is no visible pneumothorax .