Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right IJ catheter terminates in the right atrium about 1 cm below the superior cavoatrial junction , however this is somewhat exaggerated by low lung volumes . The tip of the OG tube is not definitely visualized . The ET tube is in appropriate position 4 cm from the carina . The lung volumes are low . The lungs appear asymmetric with greater opacity projecting over the left lung unchanged since yesterday . The heart and mediastinum are normal . There is no pneumothorax .
    OUTPUT:
    
Greater opacity projecting over the left lung may represent asymmetric pulmonary edema , posteriorly layering pleural effusion , or aspiration . Given the recent history of right mainstem bronchus intubation with left lung collapse this may represent post expansion edema , although it has persisted longer than expected . If clinically indicated consider repeat CXR after respiratory therapy , positioning the patient upright or in reverse Trendelenburg to clear edema or redistribute any pleural fluid which may be present . The above results were communicated via telephone by Dr . ___ to Dr . ___ ___ : 55 on ___