Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable semi-erect chest x-ray shows interval improvement of the lung ventilation , especially to the left . There are no consolidations suspicious for pneumonia . The patient has had left thoracoplasty , left hemidiaphragm is chronically elevated . Cardiomediastinal silhouette is normal . All the monitoring and support devices are unchanged and in standard position . Multiple bilateral rib fractures are unchanged . No pneumothorax . Small right pleural effusion .
    OUTPUT:
    
Minimal interval improvement of left lung ventilation , no sign of acute cardiopulmonary process .