Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiograph demonstrates unremarkable mediastinal and hilar contours . Stable mild cardiomegaly evident . Increased opacity overlying the right diaphragm on background of right lower lung atelectasis , may indicate pneumonia . No pleural effusion or pneumothorax evident . Stable L1 and T12 compression fractures . Stable degenerative changes of the right shoulder .
    OUTPUT:
    
Increased opacity of right lower lung may reflect worsening atelectasis , though in proper clinical setting , pneumonia is a possibility . No pleural effusion evident .