Webster's New World Medical Dictionary

intracytoplasmic sperm injection
An assisted
reproduction procedure in which a single sperm is
injected directly into a single egg cell in the labora-
tory to achieve fertilization. Abbreviated ICSI.
intradermal
In the skin. For example, an intrader-
mal injection is given into the skin. Abbreviated ID.
intervertebral disc
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intradermal test
A type of skin test in which an
agent (often a protein) is injected into the skin to
test the reaction to the agent. Intradermal tests are
often used to diagnose allergies and to test cellular
immunity.
intraductal carcinoma
A condition character-
ized by the proliferation of malignant cells in the lin-
ing of a breast duct without evidence of spreading
outside the duct to other tissues in the breast or out-
side the breast. Also known as ductal carcinoma in
situ, abbreviated DCIS. DCIS is clearly a precursor
(forerunner) of invasive breast cancer. DCIS origi-
nates in a single glandular structure but may spread
within the breast through the ductal system. The
goal in treating DCIS is to prevent local recurrence
and, in particular, invasive breast cancer.
intraductal papilloma
A benign, wart-like
growth that occurs in breast ducts.
intraepithelial
Within the layer of cells that
forms the surface or lining of an organ. For exam-
ple, a blister forms fluid in the intraepithelial layer
of the skin.
intrahepatic
Within the liver. For example, a
liver tumor is an intrahepatic growth.
intramuscular
Into the muscle. For example, an
intramuscular medication is given by needle into the
muscle. Abbreviated IM.