Webster's New World Medical Dictionary

thrombocytosis
See 
thrombocythemia.
thromboembolism
Formation in a blood vessel
of a clot (thrombus) that breaks loose and is carried
by the blood stream to plug another vessel. The clot
may plug a vessel in the lungs (pulmonary
embolism), brain (stroke), gastrointestinal tract,
kidneys, or leg. Thromboembolism is a significant
cause of morbidity (disease) and mortality (death),
especially in adults. Treatment may involve anticoag-
ulants (blood thinners), aspirin, or vasodilators
(drugs that relax and widen vessels).
thrombolytic agent
See 
clot-dissolving med-
ication.
thrombophilia
The tendency to form throm-
boses (blood clots in arteries and veins).
thrombophlebitis
Inflammation of a vein that
occurs when a blood clot forms.
thrombosis, cavernous sinus
See 
cavernous
sinus thrombosis.
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thrombosis, cavernous sinus
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thrombosis, deep vein
See 
deep vein
thrombosis.
thrombotic disease due to protein C defi-
ciency
See 
protein C deficiency.
thrombotic thrombocytopenic purpura
A
life-threatening disease that involves embolism and
thrombosis (plugging) of the small blood vessels in
the brain and elsewhere in the body. Abbreviated
TTP. TTP is characterized by the presence of platelet
microthrombi (tiny traveling clots composed of
platelets, the clotting cells in the blood), thrombo-
cytopenia (lack of platelets), hemolytic anemia
(from the breakup of red blood cells), fever, kidney
abnormalities, and nervous system abnormalities
such as aphasia, blindness, and convulsions. TTP
can be triggered by many drugs. Treatment may
include plasma exchange with fresh or frozen
plasma, dialysis, and corticosteroids.