Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with single lead terminating in the right ventricle . Moderate cardiomegaly is re - demonstrated . The aorta is mildly tortuous and demonstrates atherosclerotic calcifications particularly at the knob . Hazy ill - defined opacities are noted within the left upper lobe . The right lung is grossly clear , and there is no pleural effusion or pneumothorax . Degenerative changes of both acromioclavicular joints are noted .
    OUTPUT:
    
Left upper lobe hazy opacity is concerning for pneumonia or aspiration , although asymmetric pulmonary edema may also be present , particularly given the presence of smooth septal thickening on the prior CT of the cervical spine .