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Encyclopedia > Biopsy
Brain biopsy
Brain biopsy

A biopsy (in Greek: bios = life and opsy = look/appearance) is a medical test involving the removal of cells or tissues for examination. The tissue is generally examined under a microscope by a pathologist, and can also be analyzed chemically (for example, using PCR techniques). When only a sample of tissue is removed, the procedure is called an incisional biopsy or core biopsy. When an entire lump or suspicious area is removed, the procedure is called an excisional biopsy. When a sample of tissue or fluid is removed with a needle, the procedure is called a needle aspiration biopsy. Image File history File links Size of this preview: 800 × 600 pixel Image in higher resolution (1280 × 960 pixel, file size: 293 KB, MIME type: image/jpeg) Brain biopsy under stereotaxy. ... Image File history File links Size of this preview: 800 × 600 pixel Image in higher resolution (1280 × 960 pixel, file size: 293 KB, MIME type: image/jpeg) Brain biopsy under stereotaxy. ... A medical test is any kind of diagnostic medical procedure performed for health reasons. ... Drawing of the structure of cork as it appeared under the microscope to Robert Hooke from Micrographia which is the origin of the word cell being used to describe the smallest unit of a living organism Cells in culture, stained for keratin (red) and DNA (green) The cell is the... Biological tissue is a collection of interconnected cells that perform a similar function within an organism. ... Robert Hookes microscope (1665) - an engineered device used to study living systems. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Wikipedia does not yet have an article with this exact name. ... Needle aspiration biopsy is a procedure performed to diagnose and treat certain kind of illnesses. ...

In an excisional biopsy, the margins of the specimen may be carefully examined to see if the disease has spread beyond the area biopsied. "Clear margins," or "negative margins," means that no disease was found at the edges of the biopsy specimen. "Positive margins" means that disease was found, and additional treatment may be needed. The term margin has many meanings: In telecommunication, margin has the following meanings: In communications systems, the maximum degree of signal distortion that can be tolerated without affecting the restitution, without its being interpreted incorrectly by the decision circuit. ...


In cancer

Pathologic examination of a biopsy can determine whether a lesion is benign or malignant, and can help differentiate between different types of cancer. In contrast to a biopsy that merely samples a lesion, a larger excisional specimen called a resection may come to a pathologist, typically from a surgeon attempting to eradicate a known lesion from a patient. For example, a pathologist would examine a mastectomy specimen, even if a previous nonexcisional breast biopsy had already established the diagnosis of breast cancer. Examination of the full mastectomy specimen would confirm the exact nature of the cancer (subclassification of tumor and histologic "grading") and reveal the extent of its spread (pathologic "staging"). A renal cell carcinoma (chromophobe type) viewed on a hematoxylin & eosin stained slide Pathologist redirects here. ... Look up Benign in Wiktionary, the free dictionary. ... In medicine, malignant is a clinical term that means to be severe and become progressively worse, as in malignant hypertension. ... In medicine, mastectomy is the medical term for the surgical removal of one or both breasts, partially or completely. ... In the context of pathology, staging refers to the evaluation of a disease in terms of its progression in the body, or stage. This term is most often used in the context of oncology to establish the stage of development of a certain cancer. ...


Biopsy specimens are often taken from part of a lesion when the cause of a disease is uncertain or its extent or exact character is in doubt. Vasculitis, for instance, is usually diagnosed on biopsy. Skin lesions caused by Chickenpox A lesion is any abnormal tissue found on or in an organism, usually damaged by disease or trauma. ... In medicine, vasculitis (plural: vasculitides) is a group of diseases featuring inflammation of the wall of blood vessels due to leukocyte migration and resultant damage. ...

A testicular biopsy is used for evaluating the fertility of men and find out the cause of a possible infertility, e.g. when sperm quality is low, but hormone levels still are within normal ranges. [1] Infertility primarily refers to the biological inability of a man or a woman to contribute to conception. ... Semen quality is a measure of the ability of semen to accomplish fertilisation. ...

External links

  • RadiologyInfo - The radiology information resource for patients: Biopsy


  1. ^ Mens health - Testicular Biopsy

  Results from FactBites:
Biopsy (662 words)
A biopsy is a procedure performed to remove tissue or cells from the body for examination under a microscope.
Biopsies are usually performed to determine whether a tumor is malignant (cancerous) or to determine the cause of an unexplained infection or inflammation.
This type of biopsy is performed through a fiberoptic endoscope (a long, thin tube that has a close-focusing telescope on the end for viewing) through a natural body orifice (i.e., rectum) or a small incision (i.e., arthroscopy).
Hepatitis B Foundation: Liver Biopsy (316 words)
A liver biopsy is a procedure that involves taking a small piece of tissue from the liver to examine under the microscope.
A liver biopsy is considered a minor surgical procedure that is done in the hospital, but does not usually require admission (it's done as an "out-patient procedure").
It involves placing a biopsy needle inside a tube called a catheter, which is inserted into a vein in the neck and then guided into the liver to obtain a tissue sample.
  More results at FactBites »



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