Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lucency underlying the left hemidiaphragm may represent pneumoperitoneum or the stomach bubble . Correlation with left lateral decubitus views of the abdomen could be useful in differentiating between these 2 entities . Low lung volumes cause bronchovascular crowding and subsegmental atelectasis . There is no focal consolidation , pleural effusion , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette is within normal limits . Moderate acromioclavicular degenerative changes are noted bilaterally .
    OUTPUT:
    
Lucency underlying the left hemidiaphragm may represent pneumoperitoneum or the stomach . Correlation with left lateral decubitus radiographs of the abdomen would be useful to confirm the presence of free air .