Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior film , an OG type tube is present , tip extending beneath diaphragm off the inferior edge of the film . ET tube is present , tip approximately 3 .7 cm above the carina . The right IJ central line tip overlies the distal SVC . No pneumothorax detected . Note is made of slight pleural thickening at the left lung apex , similar to the prior film There are low inspiratory volumes . Cardiac silhouette unchanged . There is upper zone redistribution and vascular plethora , with mild blurring , suggesting mild CHF . However , this appearance is likely accentuated to some degree by the low lung volumes . Again seen is patchy increased retrocardiac opacity , consistent with left lower lobe collapse and / or consolidation . No effusion . The upper portion of the patient 's IVC filter is noted .
    OUTPUT:
    
1 . Interval placement of OG type tube , extending beneath the diaphragm , off the film . 2 . Probable slight worsening of CHF findings . Patchy retrocardiac opacity is similar to prior .