Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Right chest wall Port - A - Cath is noted , unchanged in position from prior with catheter tip extending into the lower SVC region . The catheter projects over the upper abdomen . EKG leads are noted overlying the chest . The lung volumes are low with mildly elevated left hemidiaphragm and mild retrocardiac linear densities most compatible with subsegmental atelectasis . The right lung is clear . The heart size appears enlarged though this is likely due to technique . Mediastinal contour is normal . Bony structures are intact .
    OUTPUT:
    
No convincing signs of pneumonia .