Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . There is vague opacity at the left costophrenic angle with loss of clear delineation of the costophrenic angle and lateral diaphragm . Elsewhere the lungs are clear . Cardiomediastinal silhouette is within normal limits for technique . No acute osseous abnormality identified .
    OUTPUT:
    
Faint opacity at the left lung base laterally , potentially technical or due to overlying soft tissues versus underlying effusion or consolidation . PA and lateral may help further characterize .