Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right PICC tip projects over the expected region of the mid SVC , unchanged . The lungs are well - expanded . Left lower lung atelectasis persists but has decreased in the interim . Moderate cardiomegaly is unchanged . No effusion or pneumothorax . Aortic knob calcifications are unchanged . The descending aorta slightly tortuous or ectatic , unchanged . Elevation of the right hemidiaphragm is also unchanged .
    OUTPUT:
    
Interval improved aeration of the lungs with persistent but decreased left lower lobe atelectasis .