Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a focal area of hazy opacity in the left lower lobe with loss of the left cardiac margin . This finding appears unchanged when compared to prior radiographs on NCT . There is prominent bronchopulmonary vascular markings with possible interstitial edema in the peripheral interlobular septa . There is no pleural effusion or pneumothorax . The imaged osseous structures are intact . There is no free air below the right hemidiaphragm .
    OUTPUT:
    
Mild pulmonary vascular congestion and interstitial edema compatible with CHF .