Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again , there is mild interstitial prominence , slightly improved from the prior exam . This likely represents mild pulmonary edema . Trace bilateral pleural effusions are unchanged . There is no consolidation or pneumothorax . The mediastinal contours are unchanged . Again , the trachea is deviated rightward , due to a known thyroid nodule identified on the CT of the cervical spine . The heart is moderately enlarged , and unchanged from the prior exam . A gas bubble in the retrocardiac area is likely due to a hiatal hernia . A large soft tissue prominence over the right shoulder is likely a hematoma .
    OUTPUT:
    
1 . Mild pulmonary edema , slightly improved from the prior exam . 2 . Stable moderate cardiomegaly . 3 . Retrocardiac gas bubble is likely due to a hiatal hernia .