Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are stable an . Bilateral reticulonodular opacities consistent with sarcoid are unchanged . New subtle lingular opacity partially obscures left heart border . No pleural effusion or pneumothorax .
    OUTPUT:
    
Subtle lingular opacity may reflect early pneumonia or progression of sarcoid .