Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate low lung volumes . Cardiomediastinal and hilar contours are within normal limits . Streaky opacity at the left lung base likely reflects atelectasis . No focal opacity convincing for pneumonia is present . There is no evidence of pleural effusion , pulmonary edema , or pneumothorax . Spinal hardware is noted involving the lower thoracic and lumbar spine .
    OUTPUT:
    
Streaky opacity at the left lung base appears atelectatic in etiology though superimposed infectious process can not be excluded .