ethmoid sinus

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Related to ethmoid sinus: Sphenoid sinus

ethmoid sinus

An air cavity or space within the ethmoid bone, opening into the nasal cavity.

ethmoid sinus

Any of the 3-18 paranasal sinuses on each side of the skull in and adjacent to the ethmoid bone. The ethmoid sinuses can be categorized as anterior, middle, or posterior, with each group usually draining into a different part of the nasal cavity. Ethmoid sinuses have very thin walls and are interconnected via openings in the septa between the sinuses.
See also: sinus

ethmoid sinus,

n one of the facial cavities, located beneath the nasal bridge, through which air flows.


1. sievelike; cribriform.
2. the ethmoid bone.

ethmoid bone
the sievelike bone that forms a roof for the nasal fossae and part of the floor of the rostral cranial fossa. See also Table 10.
ethmoid sinus
see concha.
References in periodicals archive ?
Visualizing an actual ostium from the ethmoid sinus is not a common occurrence.
The adjacent paranasal sinuses were frequently involved, especially the ethmoid sinus.
Computed tomographic (CT) and magnetic resonance imaging (MRI) scans of the head revealed a right ethmoid sinus mass that extended into the right superior nasal cavity, middle meatus, nasal septum, sphenoid wing, nasopharynx, and the right and left medial orbital wall (Figure 1, A).
2]-weighted images showed a hyperintense mass, with multiple septations and hypointense peripheral rim within the left posterior ethmoid sinus.
Combined aplasia of sphenoid, frontal, and maxillary sinuses accompanied by ethmoid sinus hypoplasia.
The mass was located on the nasal side of the medial rectus muscle, and it abutted the ethmoid sinus.
An approach to the sphenoid sinus through the ethmoid sinus requires dissection of the anterior and posterior ethmoid cells (figure, A).
The drainage pathway, or ostium, of a pneumatized uncinate process may open directly into the middle meatus, the ethmoid infundibulum or, as seen in this patient, into the ethmoid sinus.
The ethmoid sinus is divided into anterior and posterior portions.
Surgical opening of the right ethmoid sinus confirmed that the openings seen in the anterior bulla actually were draining the ethmoid bulla into the middle meatus anteriorly (figure, D).
According to the company, this system has been clinically proven to prevent obstruction of the ethmoid sinus after surgery, improving postoperative outcomes and reducing the need for additional surgery and systemic steroids.
1-8) When paranasal sinus involvement has occurred, the most common sites of origin have been the frontal sinus and the ethmoid sinus.