Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show an opacity in the left upper lobe causing bulging of the fissure on the lateral radiograph . The appearance of the left upper lobe lesion is not appreciably changed when compared to the preceding radiograph of ___ . The lungs are otherwise clear without pleural effusion or pneumothorax . The cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits and unchanged . Degenerative changes of the thoracic spine with bridging osteophytes are noted .
    OUTPUT:
    
Stable left upper lobe lesion with bulging of the fissure . Infectious causes would include Klebsiella and Haemophilus pneumonia .