Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right internal jugular venous catheter tip ends in the low SVC , unchanged . A chest tube projects over in the right lower hemithorax , also unchanged . Another chest tube projecting over the right mediastinum is also unchanged . The left mediastinal drain since been removed . The patient is now extubated . No pneumothorax . Lung volumes remain low . Small left pleural effusion and atelectasis are minimally changed , and have not progressed . Slight interval increase in mild edema , may be within normal limits post-extubation . Mild cardiomegaly in is overall unchanged . The mediastinum is unchanged . Median sternotomy wires are also unchanged .
    OUTPUT:
    
1 . Slight interval improvement in small left pleural effusion that has not progressed in size . 2 . Minimal interval increase in mild edema .