Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single lead left - sided pacer is again seen with lead extending the expected position of the right ventricle , stable . The cardiac and mediastinal silhouettes are stable . There are relatively low lung volumes . Patchy airspace opacity in the lateral left mid lung could be due to infection or pulmonary contusion . No overlying rib fracture is seen , although CT is more sensitive . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Patchy airspace opacity ( ies ) projecting over the left mid lung may be due to infection / pneumonia however , pulmonary contusion not excluded in the appropriate clinical setting .