Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low - normal . There is no focal consolidation , effusion , or pneumothorax . There is no pulmonary vascular congestion or overt pulmonary edema . There is platelike atelectasis in the left lower lung zone . Mediastinal and hilar contours are normal . Heart size is normal . Spinal hardware is seen overlying the thoracic and lumbar spine . Posterior displacement of the rods superiorly is more fully characterized on same - day CT .
    OUTPUT:
    
No evidence of pneumonia . No central vascular congestion or pulmonary edema .