Breast ductal carcinoma
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A form of breast cancer arising from epithelium of the ducts of the breast. By definition it penetrates the basement membrane. This distinguishes it from DCIS and in medical parlance is often referred to as invasive ductal carcinoma for this reason.
It forms up to 75% of infiltrative breast carcinoma.
On examination it is stony hard to touch.
The histological findings can be variable depending on the grade of the tumour. General tumour cells are arranged in groups, cords and glands.