Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . This examination is limited by very low lung volumes and suboptimal patient positioning . Central pulmonary vascular congestion appears new since the ___ examination , without overt edema . Multiple intact sternal wires are again seen . There is no large pneumothorax or pleural effusion .
    OUTPUT:
    
Central pulmonary vascular congestion appears new since the earlier study today , without overt edema . Very low lung volumes .