Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased opacification within both lung bases and an opacity overlying the spine on the lateral view . Findings are concerning for multifocal lower lobe pneumonia given the clinical history , though atelectasis is also possible . There is a small left pleural effusion . No pulmonary edema is identified . There is no pneumothorax . Cardiomediastinal and hilar contours are within normal limits . Multiple compression deformities of lower thoracic and lumbar vertebral bodies are noted . The degree of compression appears increased from prior examination though age - indeterminate .
    OUTPUT:
    
1 . Bibasilar opacities concerning for pneumonia in this patient with fever and altered mental status , though atelectasis is also possible . 2 . Probable small left pleural effusion .