Intraductal papilloma (IDP) is a benign intraductal proliferative lesion arising from the epithelium of the mammary duct system. It occurs most frequently in women aged 30–50 years and may be solitary (central) or multiple (peripheral). Symptom expression correlates with lesion location, size, and the presence of epithelial atypia. Spontaneous nipple dischargeUnilateral, single-duct discharge is the hallmark symptom. Discharge is typically serous, serosanguinous, or frankly bloody; blood-stained fluid reflects torsion or ischaemia of the papillary stalk . Palpable subareolar massA small, firm, mobile nodule may be felt behind the nipple; tenderness is uncommon unless secondary infection or haemorrhage has occurred .... Learn more