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Malignant tumours of the breast are cancerous growths that have the potential to spread (metastasize) to other parts of the body.
The most common type of malignant breast tumour is adenocarcinoma. Nearly all breast cancers start in the glandular tissue in the breast, in either the milk ducts or the milk glands. Most adenocarcinomas occur in the upper, outer part of the breast.
There are 2 main types of adenocarcinoma:
Ductal carcinoma and lobular carcinoma are also classified according to whether they are:
There are other less common types of malignant breast tumours: