Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are noted with secondary crowding of the bronchovascular markings . There is superimposed dense consolidation at the left lung base obscuring the lateral costophrenic angle . Cardiomediastinal silhouette is within normal limits . No visualized free intraperitoneal air .
    OUTPUT:
    
Left base opacity laterally which could represent pneumonia in the proper clinical setting . No free intraperitoneal air .