Carcinoma, Intraductal, Noninfiltrating

**Definition:** A noninvasive (noninfiltrating) carcinoma of the breast characterized by a proliferation of malignant epithelial cells confined to the mammary ducts or lobules, without light-microscopy evidence of invasion through the basement membrane into the surrounding stroma.

**Tree numbers:** - C04.557.470.200.025.275 - C04.557.470.200.240.187.250 - C04.557.470.615.275

**Synonyms:** - Intraductal Carcinoma, Noninfiltrating - Carcinoma, Intraductal - Ductal Carcinoma In Situ - DCIS