Invasive Ductal Carcinoma.

Hello. Thank you for writing.

Invasive ductal carcinoma (IDC), also known as infiltrating ductal carcinoma, is cancer that began growing in the duct and has invaded the fatty tissue of the breast outside of the duct. IDC is the most common form of breast cancer, representing 80 percent of all breast cancer diagnoses.

More information here: http://www.hopkinsmedicine.org/breast_center/breast_cancers_other_conditions/invasive_ductal_carcinoma.html

Helena