Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are within normal limits . Atherosclerotic calcifications are noted at the aortic knob . The pulmonary vasculature is not engorged . New focal opacity is seen within the right lower lobe which may reflect a combination of a small pleural effusion and atelectasis . Minimal atelectasis is also noted in the left lung base without focal consolidation . No pneumothorax identified . The osseous structures are diffusely demineralized . No definite displaced rib fracture is seen .
    OUTPUT:
    
1 . New focal opacity within the right lower lobe which may reflect a combination of a small right pleural effusion and associated atelectasis , though infection is not excluded in the correct clinical setting . Pulmonary infarction or pulmonary contusion are also possibilities , and consider chest CTA for further assessment . 2 . No definite displaced rib fracture identified .