Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable supine chest radiograph was provided . The right lung appears well expanded without focal consolidation . There is a left lower lung and retrocardiac opacity . Given the shift of the cardiac silhouette leftward , there is likely component of volume loss . Pneumonia can not be excluded . A left pleural effusion may be present . There is no pneumothorax . A right central line with two tips terminates in the lower right atrium . The bones are intact . There are no displaced fractures . Calcifications project over the upper abdomen , may be within the pancreas .
    OUTPUT:
    
Left lower lobe retrocardiac opacity likely due to volume loss given the shift of the mediastinum , however component of infection or effusion can not be excluded . Calcifications projecting over the upper abdomen , potentially pancreatic - correlate withpossibile history of chronic pancreatitis . Prior imaging , should it become available would be of use .