Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patchy opacities within the bilateral lung bases are new from prior examination . Differential considerations include early developing pneumonia and / or pulmonary congestion . Upper lungs are clear . No pleural effusion is identified . There is no overt interstitial edema . No pneumothorax is evident . Cardiomediastinal and hilar contours are unchanged from prior . A previously described nodular opacity within the left mid lung is not well seen on the current examination .
    OUTPUT:
    
Patchy bibasilar opacities may be due to early pneumonia and / or vascular congestion .