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Sinus
01
an air-filled cavity, especially within the bones of the skull
Exemplos
The ethmoid sinuses are small and numerous.
02
a wide blood channel that lacks the lining of a typical blood vessel
Exemplos
Damage to a major sinus can lead to severe bleeding.
03
an abnormal channel that drains a pus-filled cavity to the body surface
Exemplos
The abscess created a small sinus to the exterior.
