Search Menu
Search entire library by keyword
Choose by letter to browse topics
A B C D E F G H I J K LM N O P Q R S T U V W X Y Z 0-9
(A-Z listing includes diseases, conditions, tests and procedures)

Glossary - Pathology

| A | | B | | C | | D | | E | | F | | G | | H | | I | | J | | K | | L | | M |
| N | | O | | P | | Q | | R | | S | | T | | U | | V | | W | | X | | Y | | Z |


[return to top]

anesthesia - lack of normal sensation, especially the awareness of pain, which may be brought on by anesthetic drugs. General anesthesia causes loss of consciousness; local or regional anesthesia causes loss of feeling only to a specified area.

asymptomatic - to be without noticeable symptoms of disease.

atypical - not usual; often refers to the appearance of precancerous or cancerous cells.

autopsy - examination of a body after death. Autopsies are performed to determine cause of death, or to verify a diagnosis.


[return to top]

benign - non-cancerous.

bilateral - affecting both sides of the body. Bilateral breast cancer is cancer occurring in both breasts at the same time.

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

blood - the life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.

blood banking - the process that takes place in a laboratory to ensure that the donated blood or blood products are safe before they are used for blood transfusions or other medical procedures.

bone marrow - the soft, spongy tissue found inside bones. It is the medium for development and storage of about 95 percent of the body's blood cells.

bone marrow aspiration and biopsy - the marrow may be removed by aspiration or a needle biopsy under local anesthesia. In aspiration biopsy, a fluid specimen is removed from the bone marrow. In a needle biopsy, marrow cells (not fluid) are removed. These methods are often used together.


[return to top]

cancer - not just one disease, but rather a group of diseases. All forms of cancer cause cells in the body to change and grow out of control. Most types of cancer cells form a lump or mass called a tumor. The tumor can invade and destroy healthy tissue.

carcinoma - cancer found in body tissues that cover or line surfaces of organs, glands, or body structures.

cellular pathology (Also called cytopathology.) - the study of cellular alterations in disease.

comparative pathology - the study of disease in animals and how it compares in humans.

cyst - a closed sac in or under the skin that is filled with fluid.

cytology - the study of individual cells.


[return to top]

dermatopathology - the study of the skin in diagnosing skin diseases.

dysplasia - abnormal development of tissue.


[return to top]

edema - build-up of fluid in the tissues, causing swelling.

epithelium - a specialized type of tissue that normally lines the surfaces and cavities of the body.

excisional biopsy - surgery to remove tissue for examination.


[return to top]


[return to top]

grade - the grade of a cancer reflects how abnormal it looks under the microscope. There are several grading systems for different types of cancer.


[return to top]

hematopathology - the study of blood, bone marrow, and the organs and tissues that use blood cells to perform their functions.

hyperplasia - an increase in the number of cells in an organ or tissue.


[return to top]

immunology - the study of the body's immune system and its functions and disorders.

inflammation - the response of the tissues of the body to irritation or injury. The signs of inflammation are redness, heat, swelling, and pain.

informed consent - a legal document that explains a course of treatment, the risks, benefits, and possible alternatives; the process by which patients agree to treatment.

invasive cancer - cancer that begins in one area and then spreads deeper into the tissues of that area.


[return to top]


[return to top]


[return to top]

lesion - a destructive change in body tissue, such as a wound, injury, or inflammation.

lobe - a roundish projection of any structure. In the breast, lobes of the mammary glands radiate from the central area to the nipple area like wheel spokes.

locally invasive - a tumor which can invade the tissues surrounding it by sending out "fingers" of cancerous cells into normal tissue.


[return to top]

malignant - cancerous cells that can invade other parts of the body.

metaplasia - the phenomenon by which one type of tissue is replaced by another type.

metastasize - when cancer cells spread to other parts of the body.


[return to top]

necrosis - death of tissue.

needle biopsy - use of a needle to extract tissue, cells, or fluid for microscopic examination.

neoplasm - any abnormal growth of new tissue; a proliferation of cells no longer under normal physiologic control. These may be benign (non-cancerous) or malignant (cancerous).

neuropathology - the pathology of the nervous system.


[return to top]

"-oma" - a suffix meaning "tumor" or "lump."


[return to top]

pathology - the study of diseases.

primary site - the place where cancer begins. Primary cancer is named after the organ in which it starts. For example, cancer that starts in the kidney is always kidney cancer, even if it spreads (metastasizes) to other organs such as bones or lungs.

polyp - a structure consisting of a rounded head which grows outward from a broad base or stalk.

prognosis - predicting the likely outcome of a disease based on the condition of the patient and the action of the disease.


[return to top]


[return to top]


[return to top]

secondary tumor - a tumor that forms as a result of spread (metastasis) of cancer from the place where it started.

serology - the study of blood serum (the clear fluid that separates when blood clots).

serum - a clear fluid that separates when blood clots.

sputum (Also called phlegm.) - mucus from the lungs.

stage - the measurement of the extent of the cancer.

stem cells - the blood cells that produce other blood cells. It is the stem cells that are needed in bone marrow transplantation.


[return to top]

tumor - an abnormal lump or mass of tissue. Tumors can be benign (non-cancerous) or malignant (cancerous).


[return to top]

unilateral - affecting one side of the body. For example, unilateral kidney cancer occurs in one kidney only.


[return to top]

venipuncture - drawing blood with a needle inserted into a vein, usually in the forearm.


[return to top]

whole blood - blood containing all its components, such as red and white blood cells, platelets and more.


[return to top]


[return to top]


[return to top]

Experience Our Care

Find a physician at another Johns Hopkins Member Hospital:
Find Additional Treatment Centers at:
woman holding pill case

Johns Hopkins Home Care

We provide high quality, individualized care for patients of all ages where you feel most comfortable – your home or community. Our services and equipment are designed to help you regain and retain a level of independence.

Learn More