Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . The lungs are clear . There is no pneumothorax or pleural effusion . The patient is status post recent left mastectomy . An air - fluid level seen on the frontal and lateral projection involving the soft tissues of the lower back corresponds with findings from recent ultrasound .
    OUTPUT:
    
No acute cardiopulmonary process . Air-fluid level seen in the soft tissues of the lower back corresponds with findings from recent ultrasound and represents a subcutaneous fluid collection related to prior surgery in that area .