ethmoid sinus

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Related to Ethmoidal cells: ethmoid air cell
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Noun1.ethmoid sinus - a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
sinus - any of various air-filled cavities especially in the bones of the skull
References in periodicals archive ?
CT PNS- Coronal section-Expansile lesion along the medial orbital wall with replacement of ethmoidal cells.
Paranasal sinus magnetic resonance imaging (MRI) revealed a hyperintense mass lesion in T2-weighted images (AG) and hypointense in T1 AG in bilateral frontal sinuses and right ethmoidal cells drooping into the right orbit, with no contrast uptake following intravenous contrast material injection.
The frontal sinus is part of the anterior ethmoidal cells which evaginate from the frontal recess directly to the frontal bone.
Computed tomography (CT) scanning showed cystic lesions filling the maxillary sinuses and anterior ethmoidal cells bilaterally and causing erosion in the walls of the sinuses (Figure 2).
Most involved the frontal sinus, although the maxillary sinus, ethmoidal cells, and sphenoidal sinus can also be affected.
Also called infraorbital ethmoidal cells, these are anterior ethmoidal cells pneumatizing the floor of the orbit or the roof of the maxillary sinus.