Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 14 :03 is submitted .
    OUTPUT:
    
Tracheostomy tube remains in satisfactory position . Left PICC line is unchanged . Overall cardiac and mediastinal contours are stable . Bilateral nodular and interstitial changes are not substantially changed , although this diffuse process makes it difficult to exclude superimposed infectious process . However , no obvious airspace consolidation is seen . Stable bilateral layering effusions . No pneumothorax or pulmonary edema .