Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate low lung volumes resulting in bronchovascular crowding . There is increased opacification at the left lung base , which is concerning for pneumonia , and is similar to the most recent prior chest radiograph . There is slight increased opacification at the right base but improved from prior , which likely represents atelectasis . There is no pneumothorax , pleural effusion , or overt pulmonary edema . The cardiomediastinal and hilar contours are unchanged . No acute bony abnormality is present . The patient is status post spinal fusion , with fracture of the right - sided fusion rod , unchanged from prior exams .
    OUTPUT:
    
Increased opacification at the left lung base is concerning for pneumonia , with similar appearance to the most recent prior study .