What is a noninvasive tumor found in the breast ducts that can progress to invasive cancer?

Ductal carcinoma in situ (DCIS) is indeed the correct answer as it describes a noninvasive tumor located in the breast ducts. DCIS is characterized by abnormal cells that are confined within the ducts of the breast, meaning they have not yet invaded surrounding breast tissue. This condition is considered a precursor to invasive breast cancer, as it has the potential to progress to invasive ductal carcinoma if not treated.

Early detection and intervention are critical for DCIS, as treatment options typically lead to excellent outcomes and a reduced risk of developing invasive breast cancer. Monitoring is essential for patients diagnosed with DCIS, as it poses varying risks for progression, making it important for healthcare providers to formulate appropriate management strategies.

In contrast, fibroadenoma is a benign tumor that does not have invasive potential. Invasive ductal carcinoma and invasive lobular carcinoma, on the other hand, are both types of breast cancers that are already invasive, having spread beyond the ductal or lobular structures into surrounding tissue.