Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Aeration of the lungs has improved compared to the previous exam , but lung volumes remain low . Given the lower lung volumes on the prior exam with vascular crowding , there is minimal interval change . The heart is normal in size . Pleural effusion on the left , if any , is small and decreased from the prior exam . Appearance of the mediastinum is unchanged . The right Port - A - Cath position unchanged with its tip ending in the junction of the upper SVC internal jugular vein . No pneumothorax .
    OUTPUT:
    
Improved inspiratory effort / aeration lungs .