Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacer device is noted with leads terminating in the right atrium and right ventricle , unchanged . Heart size is mildly enlarged . Atherosclerotic calcifications are noted at the aortic knob . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . New heterogeneous consolidative opacity is demonstrated within the periphery of the left upper lung and left mid lung fields concerning for pneumonia . No pleural effusion or pneumothorax is seen . There is diffuse demineralization of the osseous structures .
    OUTPUT:
    
New heterogeneous consolidative opacity in the left upper and mid lung fields concerning for pneumonia .