Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: On the frontal view , the lungs are clear ; however , on the lateral view , there are subtle linear opacities overlying the heart which were not present on the previous exam . This could only represent a rib , but beginning of pneumonia can not be excluded . There is no pneumothorax or pleural effusion . Cardiac contour is normal .
    OUTPUT:
    
Subtle linear opacities overlying the heart seen only on the lateral view could be an artifact from the rib , however , infection can not be excluded in appropriate clinical settings . The results were posted to the radiology dashboard for direct notification of the referring physician .