Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and well - aerated lungs without pleural effusion or pneumothorax . There is no significant pulmonary edema . An unclear parenchymal process in the left upper lobe could represent a subtle pneumonia . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
1 . An unclear parenchymal process in the left upper lobe could represent a pneumonia . If there are corresponding clinical symptoms , CT is recommended to verify this finding . 2 . No significant pulmonary edema .