Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . The patient remains intubated , the ETT terminating in the trachea 5 cm above the level of the carina . No pneumothorax is seen . Heart size remains unchanged . No increased pulmonary congestion . The on the next previous examination of ___ identified left lower infiltrate , partially in retrocardiac position , persists rather unchanged . There is no evidence of pleural effusion as the left lateral pleural sinus remains free . There is no reoccurrence of any infiltrate in the right hemithorax .
    OUTPUT:
    
Stable chest findings , no evidence of pneumothorax , but persistent left lower lobe infiltrate , probably representing pneumonia .