Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interpretation of frontal and lateral chest radiograph limited secondary to poor technique . Lungs are essentially unchanged when compared to chest radiograph dated ___ with no obvious new focal opacity . Pulmonary edema appears to be improving . Mediastinal and hilar contours are stable in appearance .
    OUTPUT:
    
Radiographic interpretation limited secondary to poor technique . No new obvious focal opacity .