What symptom is commonly associated with Intraductal Papilloma?

Intraductal papillomas are benign tumors that develop in the ducts of the breast and are primarily known for causing a specific symptom: discharge from the nipple. This discharge can vary in character but is often serous (clear or yellowish fluid) or bloody. The presence of this discharge is significant in that it often prompts further investigation due to its association with breast abnormalities.

In contrast, a painless lump in the breast may be associated with various conditions, including fibrocystic changes or other types of benign tumors, but the defining symptom of intraductal papilloma is not the lump itself. Severe abdominal pain is unrelated to intraductal papillomas, as these tumors are localized to the breast tissue. Similarly, a palpable mass in the testicle pertains to scrotal or testicular issues, which is completely outside the context of breast pathologies.

Thus, the key characteristic of serous or bloody discharge is what directly links this symptom to intraductal papilloma, making it the most appropriate answer.