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http://womenshealth.about.com/cs/breastlumps/a/brstlumpbiopsy_3.htm

Breast Biopsy
The only certain way to learn whether a breast lump or mammographic abnormality is cancerous is by having a biopsy, a procedure in which tissue is removed by a surgeon or other specialist and examined under a microscope by a pathologist. A pathologist is a doctor who specializes in identifying tissue changes that are characteristic of disease, including cancer.
Tissue samples for biopsy can be obtained by either surgery or needle. The doctor's choice of biopsy technique depends on such things as the nature and location of the lump, as well as the woman's general health.

Biopsy – What is Biopsy?

Source: http://www.news-medical.net/health/Biopsy-What-is-Biopsy.aspx
A biopsy is a medical test involving the removal of cells or tissues for examination. It is the medical removal of tissue from a living subject to determine the presence or extent of a disease.
The tissue is generally examined under a microscope by a pathologist, and can also be analyzed chemically. When an entire lump or suspicious area is removed, the procedure is called an ''excisional biopsy''.

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