Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right lower lobe opacity has decreased in size compared to the prior chest radiograph . There is no new opacity , pleural effusion or pneumothorax . The cardiac and mediastinal contours are stable . Retrocardiac atelectasis is also slightly improved . There is no free air beneath the right hemidiaphragm . There is no acute osseous abnormality .
    OUTPUT:
    
Improving right lower lobe pneumonia .