Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 AP portable views of the chest . Better inspiratory effort is obtained on 1 of the 2 views . Indistinct pulmonary vascular markings are noted . The left costophrenic angle is not clearly identified , potentially due to atelectasis versus effusion . Cardiac silhouette is enlarged but stable . More dense retrocardiac opacity is identified and could be compatible with patient 's known hiatal hernia . Trachea is deviated to the left at the thoracic inlet as seen on prior potentially due to tortuosity of the vessels versus thyroid enlargement .
    OUTPUT:
    
Pulmonary vascular congestion . Left costophrenic angle obscured , potentially by atelectasis however effusion is also possible .