Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided volume loss is compatible with patient 's history of left lower lobe segmentectomy . There is subtle loss of the medial left hemidiaphragm . There is no focal consolidation on the lateral view . Trace left pleural effusion is noted as suggested by blunting of the posterior costophrenic angle . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . Degenerative changes noted in the lower thoracic spine .
    OUTPUT:
    
Small left pleural effusion . Otherwise , no acute cardiopulmonary process .