Intraductal Papilloma

IMAGING FINDINGS:​
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Mammography shows an oval, hyperdense circumscribed mass with a few punctate calcifications. Breast ultrasound shows an intraductal mass with vascular flow.
 
WHY IT MATTERS:

1. Papilloma is a common cause of bloody or clear nipple discharge.
2. The spectrum of papillary lesions from benign to malignant includes: 

                    -  Intraductal papilloma
                    -  Papilloma with atypia
                    -  Papillary DCIS
                    -  Papillary Carcinoma
    3.  May be solitary or multiple. If > 5 masses, can be considered papillomatosis.

FURTHER READING:
Breast Imaging Case of the Day (RadioGraphics, 1998)