Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube and feeding tube have been removed since the prior study . The right internal jugular line tip is at the level of the mid SVC and unchanged . The right lung is clear . There is a retrocardiac opacity at the base of the left lung , which is similar in appearance to the prior study . The heart is enlarged and the hilar contours are normal . There is no evidence of pneumothorax . There is a very small left pleural effusion .
    OUTPUT:
    
Large left lower lobe consolidation , persistent over 3 days , could represent pneumonia or lobar collapse .