Cavernous sinus thrombosis definition - medical term
A cavernous sinus thrombosis is a blood clot
within the cavernous sinus, a large channel of venous blood in a cavity bordered
by the sphenoid bone and the temporal bone of the skull.
The cavernous sinus is an important structure because of its location and its
contents which include the third cranial (oculomotor) nerve, the fourth cranial
(trochlear) nerve, parts 1 (the ophthalmic nerve) and 2 (the maxillary nerve) of
the fifth cranial (trigeminal) nerve, and the sixth cranial (abducens) nerve.
A thrombosis (clot) in this key crossroads causes the cavernous sinus syndrome
which is characterized by edema (swelling) of the eyelids and the conjunctivae of
the eyes and paralysis of the cranial nerves which course through the cavernous
sinus.
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