Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable semi-erect chest radiograph is obtained . Exam is limited by low lung volumes and portable technique . Increased hilar indistinctness and increased azygous distension suggest worsening pulmonary edema . Atelectasis at the left base is unchanged . Retrocardiac opacity is more conspicuous ; the left hemidiaphragm is completely obscured .
    OUTPUT:
    
Interval increase in mild to moderate vascular congestion . Increased retrocardiac opacity could reflect atelectasis versus consolidation .