Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate interstitial pulmonary edema , unchanged from prior exam . Underlying interstitial lung disease can not be excluded . Hilar and mediastinal silhouette are unchanged . Heart size is top normal . There is no focal consolidation or pneumothorax . Right costophrenic angle is blunted , suggestive of trace pleural effusion . Visualized osseous structures are intact .
    OUTPUT:
    
Mild interstitial pulmonary edema with possible trace right pleural effusion .