Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As on the prior exam , there are low lung volumes , likely accentuating the transverse diameter of the cardiomediastinal silhouette , unchanged . The hila are prominent , which may reflect crowding of normal bronchovascular structures and pulmonary vascular congestion . There is no overt pulmonary edema . There is no focal lung consolidation . There is no pneumothorax or pleural effusion . Posterior spinal fusion hardware consisting of rods with transpedicular screws is grossly unremarkable on limited radiographic evaluation .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process . Stable chest radiograph