diagnostics (cancer)

8/2/2019 Diagnostics (Cancer)

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Diagnostic Imaging

How is cancer diagnosed?

There is no single test that can accurately diagnose cancer. The complete evaluation of a

patient usually requires a thorough history and physical examination along with diagnostic

testing. Many tests are needed to determine whether a person has cancer, or if another

condition (such as an infection) is mimicking the symptoms of cancer. Effective diagnostic

testing is used to confirm or eliminate the presence of disease, monitor the disease process,

and to plan for and evaluate the effectiveness of treatment. In some cases, it is necessary to

repeat testing when a persons condition has changed if a sample collected was not of good

quality, or an abnormal test result needs to be confirmed. Diagnostic procedures for cancer

may include imaging, laboratory tests (including tests for tumor markers), tumor biopsy,

endoscopic examination, surgery, or genetic testing.

What are the different types of diagnostic imaging?

Imaging is the process of producing valuable pictures of body structures and organs. It is used

to detect tumors and other abnormalities, to determine the extent of disease, and to evaluate

the effectiveness of treatment. Imaging may also be used when performing biopsies and other

surgical procedures. There are three types of imaging used for diagnosing cancer:

transmission imaging, reflection imaging, and emission imaging. Each uses a different

process.

transmission imaging

X-rays, computed tomography scans (CT scans), and fluoroscopy are radiological

examinations whose images are produced by transmission. In transmission imaging, a

beam of high-energy photons is produced and passed through the body structure being

examined. The beam passes very quickly through less dense types of tissue such as

watery secretions, blood, and fat, leaving a darkened area on the x-ray film. Muscle

and connective tissues (ligaments, tendons, and cartilage) appear gray. Bones will

appear white.

o x-ray

X-rays are diagnostic tests that use invisible electromagnetic energy beams to

produce images of internal tissues, bones, and organs on film. X-rays may be

taken of any part of the body to detect a tumor (or cancer).


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o computed tomography scan (Also called a CT scan or computed axial

tomography or CAT scan.)

A CT scan is a diagnostic imaging procedure that uses a combination of x-rays

and computer technology to produce cross-sectional images (often called

slices), both horizontally and vertically, of the body. A CT scan shows detailed

images of any part of the body, including the bones, muscles, fat, and organs.

CT scans are more detailed than general x-rays.

o bone scan

Bone scans are pictures or x-rays taken of the bone after a radioactive

material has been injected that is absorbed by bone tissue. These scans are used

to detect tumors and bone abnormalities.

o lymphangiogram (LAG)

Lymphangiogram is an imaging study that can detect cancer cells orabnormalities in the lymphatic system and structures. It involves a dye being

injected into the lymph system.

o mammogram

A mammogram is an x-ray examination of the breast. It is used to detect and

diagnose breast disease in women who either have breast problems such as a

lump, pain, or nipple discharge, as well as for women who have no breast

complaints. Mammography cannot prove that an abnormal area is cancerous,

but if it raises a significant suspicion of cancer, a biopsy may be performed.

Tissue may be removed by needle or open surgical biopsy and examined under

a microscope to determine if it is cancer. Mammography has been used for

about 30 years, and in the past 15 years technical advancements have greatly

improved both the technique and results. Today, dedicated equipment, used

only for breast x-rays, produces studies that are high in quality but low in

radiation dose. Radiation risks are considered to be negligible.

reflection imaging

Reflection imaging refers to the type of imaging produced by sending high-frequency

sounds to the body part or organ being studied. These sound waves "bounce" off of thevarious types of body tissues and structures at varying speeds, depending on the

density of the tissues present. The bounced sound waves are sent to a computer that

analyzes the sound waves and produces a visual image of the body part or structure.

o ultrasound

Ultrasound, or sonography, is the most commonly used type of reflection

imaging. This technique uses high-frequency sound waves and a computer to


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create images, called sonograms, of blood vessels, tissues, and organs.

Sonograms are used to view internal organs as they function and to assess

blood flow through various vessels. Tumors in the abdomen, liver, and kidneys

can often be seen with an ultrasound.

emission imaging

Emission imaging occurs when tiny nuclear particles or magnetic energy are detected

by a scanner and analyzed by computer to produce an image of the body structure or

organ being examined. Nuclear medicine uses emission of nuclear particles from

nuclear substances introduced into the body specifically for the examination.

o magnetic resonance imaging (MRI)

MRI is a diagnostic procedure that uses a combination of a large magnet,

radiofrequencies, and a computer to produce detailed images of organs and

structures within the body. An MRI is often used to examine the heart, brain,liver, pancreas, male and female reproductive organs, and other soft tissues. It

can assess blood flow, detect tumors and diagnose many forms of cancer,

evaluate infections, and assess injuries to bones and joints.

o positron emission tomography (PET)

PET is a specialized radiology procedure used to examine various body tissues

to identify certain conditions. PET may also be used to follow the progress of

the treatment of certain conditions. PET is a type of nuclear medicine

procedure. This means that a tiny amount of a radioactive substance, called a

radionuclide (radiopharmaceutical or radioactive tracer), is used during the

procedure to assist in the examination of the tissue under study. Specifically,

PET studies evaluate the metabolism of a particular organ or tissue, so that

information about the physiology (functionality) and anatomy (structure) of the

organ or tissue is evaluated, as well as its biochemical properties. Thus, PET

may detect biochemical changes in an organ or tissue that can identify the

onset of a disease process before anatomical changes related to the disease can

be seen with other imaging processes such as computed tomography (CT) or

magnetic resonance imaging (MRI).

Cancer Diagnosis



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There is no single test that can accurately diagnose cancer. The complete evaluation of a patient usually requires a

thorough history and physical examination along with diagnostic testing. Many tests are needed to determine whether

a person has cancer, or if another condition (such as an infection) is mimicking the symptoms of cancer.

Effective diagnostic testing is used to confirm or eliminate the presence of disease, monitor the disease process, and

to plan for and evaluate the effectiveness of treatment. In some cases, it is necessary to repeat testing when apersons condition has changed, if a sample collected was not of good quality, or an abnormal test result needs to be

confirmed.

Diagnostic procedures for cancer may include imaging, laboratory tests (including tests for tumor markers), tumor

biopsy, endoscopic examination, surgery, or genetic testing.

What are the different types of laboratory tests?

Clinical chemistry uses chemical processes to measure levels of chemical components in body fluids and tissues.

The most common specimens used in clinical chemistry are blood and urine.

Many different tests exist to detect and measure almost any type of chemical component in blood or urine.

Components may include blood glucose, electrolytes, enzymes, hormones, lipids (fats), other metabolic substances,

and proteins.

The following are some of the more common laboratory tests:

blood tests

A variety of blood tests are used to check the levels of substances in the blood that indicate how

healthy the body is and whether infection is present. For example, blood tests revealing elevated

levels of waste products, such as creatinine or blood urea nitrogen (BUN), indicate that the kidneys

are not working efficiently to filter those substances out. Other tests check the presence of

electrolytes - chemical compounds such as sodium and potassium that are critical to the body's

healthy functioning. Coagulation studies determine how quickly the blood clots.

A complete blood count (CBC) measures the size, number, and maturity of the different blood cells

in a specific volume of blood. This is one of the most common tests performed. Red blood cells are

important for carrying oxygen and fighting anemia and fatigue; the hemoglobin portion of the CBC

measures the oxygen carrying capacity of the red blood cells while the hematocrit measures the

percentage of red blood cells in the blood. White blood cells fight infection. Increased numbers of

white blood cells, therefore, may indicate the presence of an infection. Platelets prevent the body

from bleeding and bruising easily.

urinalysisUrinalysis breaks down the components of urine to check for the presence of drugs, blood, protein,

and other substances. Blood in the urine (hematuria) may be the result of a benign (noncancerous)

condition, but it can also indicate an infection or other problem. High levels of protein in the urine

(proteinuria) may indicate a kidney or cardiovascular problem.

tumor markers

Tumor markers are substances either released by cancer cells into the blood or urine or substances


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created by the body in response to cancer cells. Tumor markers are used to evaluate how well a

patient has responded to treatment and to check for tumor recurrence. Research is currently being

conducted on the role of tumor markers in detection, diagnosis, and treatment of cancers.

According to the National Cancer Institute (NCI), tumor markers are useful in identifying potential

problems, but they must be used with other tests for the following reasons:

People with benign conditions may also have elevated levels of these substances in their

blood.

Not every person with a tumor has tumor markers.

Some tumor markers are not specific to any one type of tumor.

The following is a brief description of some of the more useful tumor markers:

prostate-specific antigen (PSA)

Prostate-specific antigen is always present in low concentrations in the blood of adult males. An

elevated PSA level in the blood may indicate prostate cancer, but other conditions such as benign

prostatic hyperplasia (BPH) and prostatitis can also raise PSA levels. PSA levels are used to evaluate

how a patient has responded to treatment and to check for tumor recurrence.

prostatic acid phosphatase (PAP)

PAP originates in the prostate and is normally present in small amounts in the blood. In addition to

prostate cancer, elevated levels of PAP may indicate testicular cancer, leukemia, and non-Hodgkins

lymphoma, as well as some noncancerous conditions.

CA 125

Ovarian cancer is the most common cause of elevated CA 125, but cancers of the uterus, cervix,

pancreas, liver, colon, breast, lung, and digestive tract can also raise CA 125 levels. Several

noncancerous conditions can also elevate CA 125. CA 125 is mainly used to monitor the treatment

of ovarian cancer.

carcinoembryonic antigen (CEA)

CEA is normally found in small amounts in the blood. Colorectal cancer is the most common cancer

that raises this tumor marker. Several other cancers can also raise levels of carcinoembryonic

antigen.


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alpha-fetoprotein (AFP)

Alpha-fetoprotein is normally elevated in pregnant women since it is produced by the fetus.

However, AFP is not usually found in the blood of adults. In men, and in women who are not

pregnant, an elevated level of AFP may indicate liver cancer or cancer of the ovary or testicle.

Noncancerous conditions may also cause elevated AFP levels.

human chorionic gonadotropin (HCG)

HCG is another substance that appears normally in pregnancy and is produced by the placenta. If

pregnancy is ruled out, HCG may indicate cancer in the testis, ovary, liver, stomach, pancreas, and

lung. Marijuana use can also raise HCG levels.

CA 19-9

This marker is associated with cancers in the colon, stomach, and bile duct. Elevated levels of CA

19-9 may indicate advanced cancer in the pancreas, but it is also associated with noncancerous

conditions, including gallstones, pancreatitis, cirrhosis of the liver, and cholecystitis.

CA 15-3

This marker is most useful in evaluating the effect of treatment for women with advanced breast

cancer. Elevated levels of CA 15-3 are also associated with cancers of the ovary, lung, and prostate,

as well as noncancerous conditions such as benign breast or ovarian disease, endometriosis, pelvic

inflammatory disease, and hepatitis. Pregnancy and lactation also can raise CA 15-3 levels.

CA 27-29

This marker, like CA 15-3, is used to follow the course of treatment in women with advanced breast

cancer. Cancers of the colon, stomach, kidney, lung, ovary, pancreas, uterus, and liver may also

raise CA 27-29 levels. Noncancerous conditions associated with this substance are first trimester

pregnancy, endometriosis, ovarian cysts, benign breast disease, kidney disease, and liver disease.

lactate dehydrogenase (LDH)

LDH is a protein that normally appears throughout the body in small amounts. Many cancers can

raise LDH levels, so it is not useful in identifying a specific kind of cancer. Measuring LDH levels can

be helpful in monitoring treatment for cancer. Noncancerous conditions that can raise LDH levels

include heart failure, hypothyroidism, anemia, and lung or liver disease.


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neuron-specific enolase (NSE)

NSE is associated with several cancers, but it is used most often to monitor treatment in patients

with neuroblastoma or small cell lung cancer

What are the different types of diagnostic imaging?

Imaging is the process of producing valuable pictures of body structures and organs. It is used to detect tumors and

other abnormalities, to determine the extent of disease, and to evaluate the effectiveness of treatment. Imaging may

also be used when performing biopsies and other surgical procedures. There are three types of imaging used for

diagnosing cancer: transmission imaging, reflection imaging, and emission imaging. Each uses a different process.

transmission imaging

X-rays, computed tomography scans (CT scans), and fluoroscopy are radiological examinations

whose images are produced by transmission. In transmission imaging, a beam of high-energy

photons is produced and passed through the body structure being examined. The beam passes very

quickly through less dense types of tissue such as watery secretions, blood, and fat, leaving a

darkened area on the x-ray film. Muscle and connective tissues (ligaments, tendons, and cartilage)

appear gray. Bones will appear white.

x-ray

X-rays are diagnostic tests that use invisible electromagnetic energy beams to produce

images of internal tissues, bones, and organs on film. X-rays may be taken of any part of

the body to detect tumor (or cancer) cells.

computed tomography scan (Also called a CT scan or computed axial tomography

or CAT scan.)

A CT scan is a diagnostic imaging procedure that uses a combination of x-rays and

computer technology to produce cross-sectional images (often called slices), both

horizontally and vertically, of the body. A CT scan shows detailed images of any part of thebody, including the bones, muscles, fat, and organs. CT scans are more detailed than

general x-rays.

bone scan

Bone scans are pictures or x-rays taken of the bone after a dye has been injected that is

absorbed by bone tissue. These scans are used to detect tumors and bone abnormalities.

lymphangiogram (LAG)

Lymphangiogram is an imaging study that can detect cancer cells or abnormalities in the

lymphatic system and structures. It involves a dye being injected into the lymph system.

mammogram

A mammogram is an x-ray examination of the breast. It is used to detect and diagnose

breast disease in women who either have breast problems such as a lump, pain, or nipple

discharge, as well as for women who have no breast complaints. Mammography cannot

prove that an abnormal area is cancerous, but if it raises a significant suspicion of cancer, a

biopsy may be performed. Tissue may be removed by needle or open surgical biopsy and

examined under a microscope to determine if it is cancer. Mammography has been used for

about 30 years, and in the past 15 years technical advancements have greatly improved


8/15

both the technique and results. Today, dedicated equipment, used only for breast x-rays,

produces studies that are high in quality but low in radiation dose. Radiation risks are

considered to be negligible.

reflection imaging

Reflection imaging refers to the type of imaging produced by sending high-frequency sounds to the

body part or organ being studied. These sound waves "bounce" off of the various types of body

tissues and structures at varying speeds, depending on the density of the tissues present. The

bounced sound waves are sent to a computer that analyzes the sound waves and produces a visual

image of the body part or structure.

ultrasound

Ultrasound, or sonography, is the most commonly used type of reflection imaging. This

technique uses high-frequency sound waves and a computer to create images, called

sonograms, of blood vessels, tissues, and organs. Sonograms are used to view internal

organs as they function and to assess blood flow through various vessels. Tumors in the

abdomen, liver, and kidneys can often be seen with an ultrasound.

emission imaging

Emission imaging occurs when tiny nuclear particles or magnetic energy are detected by a scanner

and analyzed by computer to produce an image of the body structure or organ being examined.

Nuclear medicine uses emission of nuclear particles from nuclear substances introduced into the

body specifically for the examination. Magnetic resonance imaging (MRI) uses radio waves with a

machine that creates a strong magnetic field that in turn causes cells to emit their own radio

frequencies.

magnetic resonance imaging (MRI)MRI is a diagnostic procedure that uses a combination of a large magnet, radiofrequencies,

and a computer to produce detailed images of organs and structures within the body. An

MRI is often used to examine the heart, brain, liver, pancreas, male and female

reproductive organs, and other soft tissues. It can assess blood flow, detect tumors and

diagnose many forms of cancer, evaluate infections, and assess injuries to bones and

joints.





to plan for and evaluate the effectiveness of treatment. In some cases, it is necessary to repeat testing when a

persons condition has changed, if a sample collected was not of good quality, or an abnormal test result needs to be

confirmed.


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What are the different types endoscopic examinations?

An endoscope is a small, flexible tube with a light and a lens on the end used to look into the esophagus, stomach,duodenum, colon, or rectum. It can also be used to take tissue from the body for testing or to take color photographs

of the inside of the body. Cystoscopes, colonoscopes, and sigmoidoscopes are types of endoscopes and are

described below:

colonoscopy

Colonoscopy is a procedure that allows the physician to view the entire length of the large intestine,

and can often help identify abnormal growths, inflamed tissue, ulcers, and bleeding. It involves

inserting a colonoscope, a long, flexible, lighted tube, in through the rectum up into the colon. The

colonoscope allows the physician to see the lining of the colon, remove tissue for further

examination, and possibly treat some problems that are discovered.

endoscopic retrograde cholangiopancreatography (ERCP)

ERCP is a procedure that allows the physician to diagnose and treat problems in the liver,

gallbladder, bile ducts, and pancreas. The procedure combines x-ray and the use of an endoscope -

a long, flexible, lighted tube. The scope is guided through the person's mouth and throat, then

through the esophagus, stomach, and duodenum. The physician can examine the inside of these

click image to enlarge


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organs and detect any abnormalities. A tube is then passed through the scope and a dye is injected,

which will allow the internal organs to appear on an x-ray.

esophagogastroduodenoscopy (Also called EGD or upper endoscopy.)An EGD (upper endoscopy) is a procedure that allows the physician to examine the inside of the

esophagus, stomach, and duodenum. A thin, flexible, lighted tube, called an endoscope, is guided

into the mouth and throat, then into the esophagus, stomach, and duodenum. The endoscope

allows the physician to view the inside of this area of the body, as well as to insert instruments

through a scope for the removal of a sample of tissue for biopsy (if necessary).

sigmoidoscopy

A sigmoidoscopy is a diagnostic procedure that allows the physician to examine the inside of a

portion of the large intestine, and is helpful in identifying the causes of diarrhea, abdominal pain,

constipation, abnormal growths, and bleeding. A short, flexible, lighted tube, called a

sigmoidoscope, is inserted into the intestine through the rectum. The scope blows air into the

intestine to inflate it and make viewing the inside easier.





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cystoscopy (Also called cystourethroscopy.)

An examination in which a scope, a flexible tube and viewing device, is inserted through the urethra

to examine the bladder and urinary tract for structural abnormalities or obstructions, such as

tumors or stones. Samples of the bladder tissue may be removed through the cystoscope for

examination under a microscope in the laboratory.

Before Undergoing Genetic Testing

MORE INFORMATION

DNA Testing

Types of Genetic Testing

Uses of Genetic Testing

Testing for mutations in genes that give an increased risk for cancer is complicated. Below is a description of

concepts that are important to understand when considering cancer susceptibility gene testing.

You may wish to speak with your physician or healthcare provider, or obtain a referral to a genetic counselor, to find

out about specific testing availability applicable to your situation.

Inquire about laboratory testing methods.

Testing methods vary from laboratory to laboratory and may affect the sensitivity of testing (the

likelihood that the lab will identify a mutation in the gene if there is a mutation present). Different

laboratory studies have the ability to detect different types of mutations. Accuracy will therefore

vary, depending upon the type of genetic testing method performed. Sometimes the type of tissue

studied also affects the likelihood of finding a mutation (i.e., tumor versus blood sample). Also,

some families may have a mutation in a gene, but the mutation is not detectable with the current

technology. In these cases, genetic testing may give a false negative result - one that indicates a

normal result when there actually is a problem.

Not all persons with what appears to be an inherited cancer will have a mutation. Reasons

for this include:

The accuracy of testing is not 100 percent.

Testing is not available for all genes associated with a hereditary cancer.

A mutation is present in the family, however, there is not yet testing available to identify it.

The individual tested in a family has developed cancer through a nongenetic mechanism

(i.e., a sporadic case), while the other cases in the family are due to a germline mutation.

The family does not have inherited cancer in spite of a clinical presentation that suggests a

genetic basis. Some such families may be the result of incorrect reporting of cancer

diagnoses in the family.

If genetic testing is done and no mutation can be identified in an affected family member

or members (i.e., one with cancer), testing unaffected relatives for the same gene will
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not help in clarifying cancer risks.

In this situation relatives of the affected person would remain at increased risk to develop cancer by

virtue of their family history.

Consider the implications of testing results:

If a person is mutation positive:

The likelihood of developing various cancers depends upon the gene in which the mutation is found

and in some cases, where in the gene the mutation is located.

Other genes and environmental risks factors may modify cancer risk.

Test results give a probability, not certainty, of cancer development and do not indicate

when cancer may develop or the stage/grade of a potential tumor.

Test results may help a person to be proactive about cancer surveillance or preventative

measures.

Test results may not change recommendations for medical management or cancer

surveillance.

If a person is mutation negative:

If there is a known mutation in the family, then he/she is not at increased risk of

developing cancer based on the family history but is at general population risk. If the

individual tested belongs to a particular ethnic group where common mutations have been

identified, then relatives should consider testing for all ethnic-specific mutations, not just

the one present in the family.

If there is not a known mutation, a negative test result is uninformative. The family may

have a mutation in the gene tested that is not detectable with the current technology or a

mutation in a different gene, since many cancer syndromes are genetically heterogeneous

(caused by mutations on one of several different genes).

If a variant of uncertain significance is found:

In this case, an alteration in the DNA of a gene has been identified, but it is unknown

whether the alteration will actually affect the function of the gene and, as such, influence

cancer risk. Further studies may be indicated (if available). If a significant family history is

present, such a result does not rule out a hereditary cancer syndrome in a family.

Consider the psychosocial implications of testing.

Increased or decreased emotional distress may be experienced after testing for mutations in cancer

susceptibility genes. Relationships with family members may change, particularly if one person is

mutation positive, while another is mutation negative. Some individuals experience guilt when they

are the only person in their family without a mutation. Communication between family members can

improve or stop altogether depending upon test results. It is important to try to anticipate potential

problems in the family related to testing before proceeding.


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Consider the economic impact.

Testing for cancer susceptibility genes may/may not be covered by insurance, and can be costly.

Check with your insurance company about coverage prior to having testing performed. Some

laboratories perform testing for free or for a nominal fee, if part of a research study. Additionally,

programs are sometimes available to assist with covering the cost of genetic testing, depending

upon the laboratory.

Consider the risks of genetic discrimination.

Many people are concerned about the risk for genetic discrimination. Genetic discrimination is when

a person is discriminated against based on their genetic information alone. An example of genetic

discrimination would be if an insurer were to increase your premiums because they found out you

carry a mutation that increases your risk to develop cancer, even though you do not currently have

cancer and may not develop the disease. In this situation, information about legislation which

provides protection against genetic discrimination in health insurance, life insurance, and

employability at the state level can be found at the National Human Genome Research Institute on

the Online Resources page of this website.

On the federal level, the Health Insurance Portability and Accountability Act of 1996 provides some

protection against genetic discrimination with regard to health insurance for individuals with group

policies.

Remember that testing options change.

Remember that technology is rapidly advancing. If you are a person for whom no testing currently

exists, testing options may become available in the near future.

Take your time.

Do your homework and be sure to take the time to explore the above issues before undergoing

testing for mutations in cancer susceptibility genes, in order to fully understand the implications of

your test results. Remember, genetic testing is a personal choice, and is not for everyone. Only youcan decide what is right for you






to plan for and evaluate the effectiveness of treatment. In some cases, it is necessary to repeat testing when a

persons condition has changed, if a sample collected was not of good quality, or an abnormal test result needs to beconfirmed.



What are the different types of tumor biopsies?


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A biopsy is a procedure performed to remove tissue or cells from the body for examination under a microscope.

Some biopsies can be performed in a physician's office, while others need to be done in a hospital setting. In

addition, some biopsies require use of an anesthetic to numb the area, while others do not require any sedation.

Biopsies are usually performed to determine whether a tumor is malignant (cancerous) or to determine the cause of

an unexplained infection or inflammation. The following are the most common types of biopsies:

endoscopic biopsy

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). The endoscope is used to view the organ in question for abnormal or

suspicious areas, in order to obtain a small amount of tissue for study. Endoscopic procedures are

named for the organ or body area to be visualized and/or treated. The physician can insert the

endoscope into the gastrointestinal tract (alimentary tract endoscopy), bladder (cystoscopy),

abdominal cavity (laparoscopy), joint cavity (arthroscopy), mid-portion of the chest

(mediastinoscopy), or trachea and bronchial system (laryngoscopy and bronchoscopy).

bone marrow biopsy

This type of biopsy is performed either from the sternum (breastbone) or the iliac crest hipbone

(the bone area on either side of the pelvis on the lower back area). The skin is cleansed and a local

anesthetic is given to numb the area. A long, rigid needle is inserted into the marrow, and cells are

aspirated for study; this step is occasionally uncomfortable. A core biopsy (removing a small bone

'chip' from the marrow) may follow the aspiration.

excisional or incisional biopsy

This type of biopsy is often used when a wider or deeper portion of the skin is needed. Using a

scalpel (surgical knife), a full thickness of skin is removed for further examination, and the wound is

sutured (sewed shut with surgical thread). When the entire tumor is removed, it is called excisional

biopsy technique. If only a portion of the tumor is removed, it is called incisional biopsy technique.Excisional biopsy is often the method usually preferred when melanoma (a type of skin cancer) is

suspected.

fine needle aspiration (FNA) biopsy

This type of biopsy involves using a thin needle to remove very small pieces from a tumor. Local

anesthetic is sometimes used to numb the area, but the test rarely causes much discomfort and

leaves no scar. FNA is not used for diagnosis of a suspicious mole, but may be used to biopsy large

lymph nodes near a melanoma to see if the melanoma has metastasized (spread). A computed

tomography scan (CT or CAT scan) - an x-ray procedure that produces cross-sectional images of the

body - may be used to guide a needle into a tumor in an internal organ such as the lung or liver.

punch biopsy

Punch biopsies involve taking a deeper sample of skin with a

biopsy instrument that removes a short cylinder, or "apple

core," of tissue. After a local anesthetic is administered, the

instrument is rotated on the surface of the skin until it cuts

through all the layers, including the dermis, epidermis, and the

most superficial parts of the subcutis (fat).

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shave biopsy

This type of biopsy involves removing the top layers of skin by shaving it off. Shave biopsies are

also performed with a local anesthetic.

skin biopsy

Skin biopsies involve removing a sample of skin for examination under the microscope to determine

if melanoma is present. The biopsy is performed under local anesthesia. The patient usually just

feels a small needle stick and a little burning for about a minute, with a little pressure, but no pain.

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