The filling defect in the main duct is a papilloma. Ultrasound confirmed the lesion's intraductal location and FNA was performed under ultrasound guidance.
Galactography seems to be a dying art. It makes sense in reproducible single duct discharges. There is no correlation between the color of the discharge and the final histology. Patients with multiple duct discharges or bilateral discharges do not qualify for ductography.