Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is moderately enlarged . The right mediastinal and hilar contours are normal . Pulmonary nodules seen on ___ PET - CT can not be definitively correlated on today 's study . A left upper lobe opacity is seen which represents fluid in the major fissure . A moderate left pleural effusion present which by itself does not completely explain symptoms but could relate to findings not seen on plain film radiography .
    OUTPUT:
    
1 . Moderate left pleural effusion and left major fissure fluid collection without definitive evidence of pneumonia . 2 . Previously seen pulmonary nodules can not be evaluated on today 's study and are better characterized on PET - CT from ___ .