Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacification of the left hemithorax is re - demonstrated compatible with chronic left upper lobe collapse and left lower lobeectomy changes . Leftward shift of mediastinal structures is re - demonstrated as result of the volume loss . The right lung demonstrates linear scarring or atelectasis within the mid lung field , but is without focal consolidation , pleural effusion or pneumothorax . No pulmonary vascular engorgement is present . Patient is status post median sternotomy . Diffuse demineralization of the osseous structures is again noted with chronic compression deformity of T12 and evidence of posterior fusion within the upper lumbar spine . Left - sided rib deformities are compatible with prior surgery .
    OUTPUT:
    
Chronic opacification of the left hemithorax compatible with chronic left upper lobe collapse and prior left lower lobectomy changes . Right lung is essentially clear .