Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . No confluent opacities are identified . There is no pulmonary edema or pleural effusions . Cardiomediastinal and hilar contours are generally within normal limits . Mediastinal clips and median sternotomy wires appear unchanged from prior but the lateral view shows a larger than usual postoperative retrosternal hematoma . It contains no gas and there is no accompanying pleural effusion to suggest infection . If the source of the chest pain does not become clear it is possible that an organizing hematoma is responsible .
    OUTPUT:
    
No obvious acute cardiopulmonary process . Retrosternal hematoma as unlikely cause of pain was discussed with Dr ___ telephone at the time of dictation .