Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable semi upright view of the chest . Tracheostomy tube is noted . There is a left upper extremity PICC line again noted with its tip in the mid SVC region . Lung volumes are markedly low . Lower lung opacities may reflect bronchovascular crowding and atelectasis though pneumonia can not be excluded . The upper lungs appear relatively well aerated . The heart size can not be assessed due to low lung volumes . The mediastinal contour is stable . Bony structures are intact .
    OUTPUT:
    
PICC line positioned appropriately . Lower lung opacities in the setting of low lung volumes may reflect atelectasis though pneumonia can not be excluded .