Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is new mild rightward shift of mediastinal structures , probably due to atelectasis in the right lower lobe with a small - to - moderate new right - sided pleural effusion . Projecting over the left upper lung is a small nodular focus that is not perceptible on the prior study . Possibly it reflects a prior healed fracture involving the posterolateral course of the left sixth rib , but the healed fracture was already there and otherwise unchanged , so the possibility of a pulmonary nodule projecting over the same area should be considered and excluded . There is no evidence for pleural effusion on the left . There is no pneumothorax . Bony demineralization with mild degenerative changes are noted along the thoracic spine . It is difficult to compare an upper lumbar compression deformity at L1 with the prior study , although it can be discerned .
    OUTPUT:
    
1 . New right basilar opacity with volume loss and pleural effusion . Parenchymal opacification may be explained by atelectasis associated with the presence of an effusion , although an infectious etiology can not be entirely excluded . 2 . Small nodular focus projecting over the left upper lung . A lung nodule can not be excluded . When clinically appropriate , short - term repeat PA and lateral radiographs are recommended to see whether the nodular focus is persistently demonstrated or chest CT evaluation could be considered .