Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slight increased opacification in the left lower lung . Subsegmental atelectasis in the right lower lung , unchanged from prior . No pulmonary edema , pleural effusion , or pneumothorax . No cardiomegaly . Stable mediastinum and hila . Pleura is unremarkable . No subdiaphragmatic intra-abdominal free air .
    OUTPUT:
    
Left lower lobe pneumonia .