Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi erect frontal image of the chest . Of note , the right costophrenic angle is excluded from this study . The pacemaker is seen overlying the left chest with intact leads in appropriate position . Lung volumes are low with associated bronchovascular crowding . A subtle opacity is seen in the right upper lobe , likely representing residual changes from prior pneumonia . The lungs otherwise clear . There is no visualized pleural effusion . There is no pneumothorax . The cardiomediastinal silhouette is stable from prior exam .
    OUTPUT:
    
No acute cardiopulmonary process .