Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal lateral views chest were performed . Cardiac silhouette is normal in size . Mild pectus excavatum is again seen . No pleural effusion , pneumothorax or focal airspace consolidation . Mediastinal contours and hilar structures are unremarkable . No acute osseous abnormalities appreciated .
    OUTPUT:
    
Pectus excavatum , unchanged .