Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Opacity in the right mid to lower lung is noted which is new from the prior exam and could reflect atelectasis versus pneumonia . A small adjacent effusion is difficult to exclude . Left lung is grossly clear . Heart size difficult to assess . Mediastinal contour is grossly within normal limits . No pneumothorax . Bony structures are intact .
    OUTPUT:
    
Interval development of opacity within the right mid to lower lung , which could represent atelectasis and pneumonia with small effusion . Recommend followup to resolution .