Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal image of the chest demonstrates low lung volumes , which makes it difficult to determine if there has been interval change in the pneumonia . There is definitely no interval improvement , but can not say certainly if there has been worsening or not . There are no pleural effusions or pneumothorax . Tracheostomy tube is located in the same position as on previous imaging . Cardiomediastinal silhouette is unchanged . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Interpretation limited by low lung volumes , but bilateral pneumonia appears to be same as on previous imaging , though can not exclude interval worsening .