Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Analysis is performed with the next preceding similar study obtained nine hours earlier during the same day . Position of tracheostomy cannula and previously described right - sided PICC line completely unchanged . Heart size remains normal and unremarkable appearance of thoracic aorta . No increased widening of superior mediastinal structures . No evidence of apical pneumothorax or local hematoma formation . Lungs remain well aerated bilaterally . Previously described mostly linear bibasilar opacities appear stable and do not show any significant interval change .
    OUTPUT:
    
Stable chest findings , no new abnormalities since next preceding study .