Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is new focal opacity at the left cardiophrenic angle . Elsewhere , the lungs are clear without effusion or pulmonary vascular congestion . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is detected .
    OUTPUT:
    
Focal opacity in the lingula which may represent pneumonia . Recommend repeat after treatment to document resolution .