Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is normal in size . The hilar and mediastinal contours are within normal limits . There is focal linear opacities likely atelectasis at the right lung base . More subtle peripheral opacity at the right lung base laterally on the frontal view is also noted . No pneumothorax or pleural effusion . No acute osseous abnormalities .
    OUTPUT:
    
Linear opacity at the right lung base likely atelectasis . More peripheral , pleural - based parenchymal opacity at the right lung base laterally . Given clinical symptoms , CTA should be considered to evaluate for possible underlying infarct in the setting of pulmonary embolus .