Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates ET tube and enteric tube to be in standard position . A left transthoracic chest tube is similar in configuration as compared to prior exam , with maried angulation superiorly , and possible obstruction as correlated with prior CT dated ___ . The cardiomediastinal silhouette is within normal limits . There may be trace lucency along the left heart boarder , which could represent air related to a small anterior pneumothorax or small pneumopericardium , not significantly changed since prior exam . The lungs are low in volume but clear . There is no pneumothorax , pleural effusion , or confluent consolidation . A nondisplaced left lower rib fracture is better delineated on prior CT dated ___ .
    OUTPUT:
    
1 . Sharply angulated left chest tube with possible obstruction as correlated with prior CT dated ___ . 2 . Trace linear lucency along left heart boarder likely represents a small residual anterior pneumothorax , versus less likely small pneumopericardium , but similar to one day prior .