Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable AP view of the chest was provided . A left arm PICC line is seen with its tip in the region of the low SVC , unchanged . There is persistent hazy opacification in the lower lungs which could represent atelectasis or pneumonia . Overall , findings are unchanged . The upper lungs appear well aerated . The hila appear somewhat prominent , though this is unchanged . The bony structures are intact .
    OUTPUT:
    
No significant change from prior exam .