Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The cardio mediastinal silhouette is unchanged with mild cardiomegaly and ectatic and unfolded thoracic aorta , better assessed on prior CT . There is hilar congestion and possible mild interstitial pulmonary edema . No large effusion or pneumothorax is seen . Imaged osseous structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Pulmonary vascular congestion and probable mild edema . Stable cardiomediastinal silhouette in a patient with known unfolded and ectatic thoracic aorta .