Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild enlargement of cardiac silhouette . The aortic knob is calcified . Mediastinal and hilar contours are within normal limits . There is no pulmonary vascular congestion . Minimal linear opacities in the lung bases likely reflect subsegmental atelectasis . Blunting of the left posterior costophrenic angle on the lateral view likely reflects a trace pleural effusion . There is no focal consolidation or pneumothorax . There is diffuse demineralization of the osseous structures . No acute osseous abnormalities seen .
    OUTPUT:
    
Probable small left pleural effusion posteriorly . Mild bibasilar subsegmental atelectasis .