Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear unchanged . There is patchy left lower lung opacity obscuring the left hemidiaphragm , probably within the lingula , which is non-specific but most suggestive of minor atelectasis . There is no evidence for pneumomediastinum or pneumothorax . There is no pleural effusion . Bony structures are unremarkable .
    OUTPUT:
    
Patchy opacity in the lingula , most suggestive of minor atelectasis . Pneumonia is difficult to completely exclude , although doubted . Short - term follow - up radiographs could be considered if clinically indicated . No evidence for pneumomediastinum or mediastinal widening .