Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Low lung volumes results in bronchovascular crowding . There is no focal consolidation , pleural effusion , or pneumothorax . The cardiac and mediastinal silhouettes are unchanged . Pulmonary vasculature is within normal limits . The left pacemaker leads are in stable position . Prosthetic aortic valve is again seen . Median sternotomy wires are intact .
    OUTPUT:
    
No pneumonia , edema , or effusion .