martes, 17 de mayo de 2011

Breast Cancer

Causes | Symptoms | Diagnosis | Stages | Treatment
Sometimes abnormal cells develop in the breast tissue, forming a lump or tumor. This is the most common type of cancer in women. 
The breast has several lobes, which are dividedinto lobules and end in the milk glands. Tiny ducts run from the many tinyglands, connect together, and end in the nipple. Anytissue in the breast can be affected and it will destroy the nearby tissuesalso.  Usually the cancer arises from tissue that forms milk ducts. Thereare at least 15 different  kinds, depending on the site  ofdevelopment . Both women and men can develop breast cancer, but it is very rarein men.
Breast cancer occurs more commonly in the leftbreast than the right and more commonly in the outer upper quadrant. The tumormay distort the shape of the breast or the texture of the skin as it becomeslarger. It can be detected when it grow large enough to either be felt or seenon a mammogram.  
The cancer cells spread through the specialisedchannels in the breast called lymphatics to the lymph nodes to form tumors. Italso spread or metasize to the other parts of the body through the blood stream.It spreads through the right side of the heart to the lungs, and eventually tothe other breasts, the chest wall, liver, bone and brain. Spreading of the tumorto other parts of the body can cause death.
Breast cancer can be classified by histologicappearance and location of the lesion. 
  • Adenocarcinoma - arising from the epithelium.
  • Intraductal - developing within the ducts
  • Infiltrating - Occurring in parenchyma of the breast.
  • Inflammatory - reflecting rapid tumor growth, in which the overlying skin become edematous, inflamed and in-durated.
  • Lobular carcinoma in situ - reflecting tumor growth involving lobes of glandular tissue.
  • Medullary or circumscribed - large tumor with rapid growth rate.

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