Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Focal rounded opacity projecting over the left cardiophrenic angle on the frontal view and retrocardiac on the lateral view is similar in appearance compared to the prior study from ___ and may represent a hiatal hernia or herniated omental fat . No pulmonary edema is seen .
    OUTPUT:
    
No acute cardiopulmonary process . No pulmonary edema .