Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear without consolidation . No pulmonary vascular congestion or interstitial edema is evident . There is minimal blunting of the right costophrenic angle , which is new and may reflect a tiny amount of pleural fluid . Mediastinal and hilar contours are within normal limits . Mild cardiomegaly is stable .
    OUTPUT:
    
No pulmonary edema . Possible trace right pleural effusion .