Invasive carcinoma of no special type
![Mastectomy specimen containing a very large invasive ductal carcinoma of the breast. To the right, the nipple can be seen on the pink skin, while in the center of the picture a large blue and pink swelling or tumor can be seen. At the edges of this surgical specimen fat tissue (orange/red) can be observed.](/Images/godic/202501/25/BreastCancer3739.jpg")
![Typical macroscopic (gross) appearance of the cut surface of a mastectomy specimen containing an invasive ductal carcinoma of the breast (pale area at the center).](/Images/godic/202501/25/Breast_cancer_gross_appearance3739.jpg")
Invasive carcinoma of no special type (NST) also known as invasive ductal carcinoma or ductal NOS and previously known as invasive ductal carcinoma, not otherwise specified (NOS) is a group of breast cancers that do not have the "specific differentiating features". Those that have these features belong to other types.