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 within normal limits . The frontal view is not symmetrical and difficult to evaluate , but there is a vague patchy opacity in the lingula , although most likely due to minor atelectasis . A nipple shadow is visualized on the right side . Hemidiaphragms appear flattened suggesting hyperinflation . There is no definite pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Patchy opacity in the lingula , which is not specific as to etiology ; pneumonia is not excluded , but the area is not well evaluated and opacity may be due to atelectasis . Noting the technical limitations of the film followup PA and lateral radiographs may be helpful if pulmonary symptoms were to persist .