picture of mammography (ductography) with multiple filling defects.. gas bubbles. Multiple Papillomas. Granulomas. blood clots

picture of mammography (ductography) with multiple filling defects, this can be caused by all of the following except:
- air (gas bubbles).
- Multiple Papillomas.
- Granulomas.
- Invasive lobular carcinoma (True).
- blood clots.