There are several different types of breast cancer, which can develop in different parts of the breast.
Breast cancer is often divided into:
non-invasive breast cancer (carcinoma in situ) – found in the ducts of the breast (ductal carcinoma in situ, DCIS) and hasn't developed the ability to spread outside the breast. It's usually found during a mammogram and rarely shows as a breast lump.
invasive breast cancer – usually develops in the cells that line the breast ducts (invasive ductal breast cancer) and is the most common type of breast cancer. It can spread outside the breast, although this doesn't necessarily mean it has spread.
Other less common types of breast cancer include:
invasive (and pre-invasive) lobular breast cancer
inflammatory breast cancer
Paget's disease of the breast
It's possible for breast cancer to spread to other parts of the body, usually through the bloodstream or the axillary lymph nodes. These are small lymphatic glands that filter bacteria and cells from the mammary gland.
If this happens, it's known as secondary, or metastatic, breast cancer.
Dementia is a syndrome (a group of related symptoms) associated with an ongoing decline of brain functioning. This may include problems with: memory loss thinking speed mental sharpness and quickness language understanding judgement mood movement difficulties carrying out daily activities There are many different causes of dementia. People often get confused about the difference between Alzheimer's disease and dementia. Alzheimer's disease is a type of dementia and, together with vascular dementia, makes up the vast majority of cases. People with dementia can become apathetic or uninterested in their usual activities, or may have problems controlling their emotions. They may also find social situations challenging and lose interest in socialising. Aspects of their personality may change. A person with dementia may lose empathy (understanding and compassion), they may see or hear things that other people do not (hallucinations). Because people with dementia may lose t...