Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes . Hilar vascular engorgement and interstitial edema has increased since ___ . Trace if any bilateral pleural effusions are present . A subtle confluent opacity in the left midlung may represent pneumonia vs . fissural fluid . Cardiomegaly is unchanged . Heart and mediastinal contours are normal .
    OUTPUT:
    
1 . Pulmonary edema . 2 . Focal opacity in the left upper lobe may reflect fissural fluid vs . superimposed pneumonia . Consider f / u CXR post diuresis .