Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes cause bronchovascular crowding . Allowing for this , there is focal increased opacity along the right base with newly indistinct margins of the right hemidiaphragm , which may represent atelectasis or pneumonia , depending upon the clinical setting . There is no pulmonary edema or pneumothorax . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Focal opacity in the right lung base silhouetting the right hemidiaphragm may represent atelectasis or early pneumonia , depending upon the clinical setting .