Webster's New World Medical Dictionary

heat prostration
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syndrome are considered at increased risk for com-
plications in future pregnancies.
helper T cell
See 
T-4 cell.
helper/supressor ratio
The ratio of T-helper
(T-4; cells expressing the CD4 antigen) cells to
supressor (T-8; cells expressing the CD8 antigen)
cells in the bloodstream. This value is used in the
diagnosis and management of conditions that affect
immune functioning, including HIV infection.
hemangioma
A benign tumor formed by a col-
lection of excess blood vessels. A hemangioma may
be visible through the skin as a birthmark, known
colloquially as a “strawberry mark.” Most heman-
giomas that occur at birth disappear after a few
months or years.
hemangioma, capillary
A type of hemangioma
that is composed almost entirely of tiny capillary
vessels. Capillary hemangiomas may appear any-
where on the body but are most common on the
face, scalp, back, and chest. They may be evident at
birth or become noticeable several weeks later.
They usually grow quickly and then remain fixed in
size and, with time, spontaneously subside. The vast
majority are gone by the time the patient is age 10.
No treatment is needed. Capillary hemangiomas
include strawberry hemangiomas, strawberry
marks, and salmon patches. See also 
salmon patch.
hemangioma, cavernous
A type of heman-
gioma composed of blood-filled “lakes” and chan-
nels. A cavernous henangioma is raised and red or
purplish. Small cavernous hemangiomas on the sur-
face of the body may be removed or treated by elec-
trocoagulation. Surgery is sometimes needed.