Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP upright view of the chest was obtained . Lung volumes are low . There is dense retrocardiac opacification with obscuration of the medial margin of the left hemidiaphragm , consistent with left lower lobe consolidation . Streaky opacities at the right base probably reflect atelectasis . Cardiomediastinal silhouette is otherwise stable . Prominence of the right paratracheal soft tissues is unchanged . There is no large effusion or pneumothorax .
    OUTPUT:
    
Dense retrocardiac opacification , consistent with left lower lobe pneumonia in the appropriate clinical setting .