Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is a large anterior mediastinal collection , likely representing a hematoma . There is a small left pleural effusion . No pneumothorax . No pulmonary edema . Subcutaneous emphysema is related to patient 's recent surgery . There has been interval removal of right IJ catheter . Median sternotomy wires and mediastinal clips are intact .
    OUTPUT:
    
Large anterior mediastinal collection , likely representing hematoma . Small left pleural effusion .