Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates stable - appearing partially loculated moderate - sized right pleural effusion with adjacent right lower lobe and right middle lobe atelectasis . This is an unusually persistent post-operative fluid collection with a partial fissural component . Stable rightward shift of the mediastinum . Initially , there was concern over a linear lucency at the right superior mediastinum , but despite initial impression , it is ultimately felt that this does not represent pneumomediastinum . There is no pneumothorax . Mediastinal and hilar contours are unchanged . Patient is status post CABG with median sternotomy wires in place .
    OUTPUT:
    
1 . No evidence of pneumomediastinum . 2 . Unusually persistent post-operative fluid collection with partial fissural component .