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Oat
cell cancer: A type of lung cancer in which the
cells look like oats. Also called small cell lung cancer.
Oligodendroglioma (OL-ih-go-den-dro-glee-O-ma):
A rare, slow growing type of brain tumor that occurs
in the cells that produce myelin, the fatty covering
that protects nerves.
Ommaya reservoir (o-MYE-a REZ-er-vwahr): A device
implanted under the scalp and used to deliver anticancer
drugs to the fluid surrounding the brain and spinal
cord.
Oncogene: The part of the cell that normally
directs cell growth, but which can also promote or allow
the uncontrolled growth of cancer if damaged (mutated)
by an environmental exposure to carcinogens, or damaged
or missing because of an inherited defect.
Oncologist (on-KOL-o-jist): A doctor who specializes
in treating cancer. Some oncologists specialize in a
particular type of cancer treatment. For example, a
radiation oncologist specializes in treating cancer
with radiation.
Oncology: The study of tumors encompassing the
physical, chemical, and biologic properties.
Oophorectomy (oo-for-EK-to-mee): The removal
of one or both ovaries.
Ophthalmoscope (off-THAL-mo-skope): A lighted
instrument used to examine the inside of the eye, including
the retina and the optic nerve.
Optic nerve: The nerve that carries messages
from the retina to the brain.
Oral surgeon: A dentist with special training
in surgery of the mouth and jaw.
Orchiectomy (or-kee-EK-to-mee): Surgery to remove
the testicles.
Organisms: Plants, animals, and other forms of
life that are made up of complex and interconnected
systems of cells and tissue.
Oropharynx (or-o-FAIR-inks): The area of the
throat at the back of the mouth.
Osteosarcoma (OSS-tee-o-sar-KO-ma): A cancer
of the bone that is most common in children. Also called
osteogenic sarcoma.
Ostomy (AHS-toe-mee): An operation to create
an opening from an area inside the body to the outside.
See Colostomy.
Otolaryngologist (AH-toe-lar-in-GOL-o-jist):
A doctor who specializes in treating diseases of the
ear, nose, and throat.
Ovaries (O-var-eez): The pair of female reproductive
glands in which the ova, or eggs, are formed. The ovaries
are located in the lower abdomen, one on each side of
the uterus. |
