Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and moderately well - aerated lungs . Interstitial abnormality , left lower lobe greater than right , is noted . There is no appreciable pleural effusion or pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Asymmetric interstitial abnormality , left greater than right , without cardiomegaly or pleural effusion . Atypical pneumonia is favored over asymmetrical pulmonary edema .