Management of Pathologic Nipple Discharge

Initial Assessment and Classification

The American College of Radiology recommends that nipple discharge be categorized as either physiologic or pathologic based on specific characteristics, with pathologic discharge characterized by spontaneous occurrence, unilateral presentation, single duct involvement, and bloody, serous, or serosanguineous appearance 1, 2
Pathologic discharge is more likely to be associated with underlying malignancy, especially if it is spontaneous, unilateral, and from a single duct 1

The American College of Radiology recommends diagnostic mammography or digital breast tomosynthesis (DBT) as the initial imaging evaluation for patients with pathologic nipple discharge and breast implants, followed by breast ultrasound as a complementary examination 3, 4
Ultrasound is particularly valuable for evaluating the retroareolar region and can detect lesions that may be obscured on mammography, with special techniques such as use of standoff pad or abundant warm gel, and peripheral compression and rolled-nipple techniques 5

Underlying malignancy can be found in 5-21% of patients with pathologic nipple discharge who undergo biopsy, with the most common cause being intraductal papilloma (35-48% of cases) 1
Risk factors for malignancy in patients with nipple discharge include age over 40 years, presence of a palpable mass, unilateral discharge from a single duct, and bloody or watery discharge 1

The American College of Radiology recommends an initial evaluation with diagnostic mammography/DBT and ultrasound of both breasts, followed by additional studies such as ductography or MRI if initial imaging is negative 3, 4, 5, 7
If imaging identifies a lesion, image-guided core biopsy should be performed for tissue diagnosis, and if all imaging is negative but pathologic discharge persists, surgical consultation for central duct excision should be considered 2, 6, 7