Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No pleural effusion is seen . There is no pneumothorax . Cardiac silhouette is mildly enlarged . Mediastinal contours are unremarkable and stable . There is increase in pulmonary vasculature bilaterally suggesting mild interstitial edema , increased as compared to the prior study . Difficult to exclude underlying pulmonary nodule , and if this is of clinical concern , chest CT is more sensitive .
    OUTPUT:
    
Mild interstitial edema . Mild cardiomegaly .