Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Atherosclerotic calcifications are noted at the aortic knob . Mediastinal and hilar contours are unremarkable . New consolidative opacification is seen involving the entire left upper lobe . Right lung is clear . Hyperinflation of the lungs with attenuation of pulmonary vascular markings towards the apices is compatible with underlying emphysema . Streaky bibasilar airspace opacities likely reflect areas of atelectasis . No pleural effusion or pneumothorax is identified on this supine exam . Cholecystectomy clips are demonstrated in the right upper quadrant of the abdomen .
    OUTPUT:
    
Consolidative opacification involving the entire left upper lobe is concerning for pneumonia . Please note that pulmonary embolism with infarction is not excluded , and if there is concern , a chest CT is recommended . Emphysema .