Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior radiograph , the right PICC is high , in the right brachiocephalic vein , overall unchanged . Lung volumes are persistently low , with bibasilar consolidations . There is a question of free right subdiaphragmatic air . . Moderate cardiomegaly and is unchanged . Small left pleural effusion is smaller . No pneumothorax .
    OUTPUT:
    
1 . There is a question of free right subdiaphragmatic air . A PA and lateral radiograph may be useful for further evaluation . 2 . Persistent bibasilar opacities may reflect underlying infection . 3 . Unchanged positioning of the right PICC , with tip in the right brachiocephalic vein .