sinus

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sinus,

cavity or hollow space in the body, usually filled with air or blood. In humans the paranasal sinuses, mucus-lined cavities in the bones of the face, are connected by passageways to the nose and probably help to warm and moisten inhaled air. When drainage from them is blocked, as after a cold, these sinuses often become infected, a condition called sinusitis. The accumulation of pus results in pressure, headaches, pain, and general discomfort. In invertebrates one of the spaces among the muscles and viscera through which blood returns to the heart is also known as a sinus.

sinus

(sÿ -nŭs) A semienclosed break along the borders of a lunar mare or in a scarp. The word is used in the approved name of such a feature on the Moon. (Latin: bay)

Sinus

 

in anatomy, a cavity, protrusion, or long closed channel. In vertebrates (including man), the term “sinus” refers to a channel filled with venous blood in the dura mater. The cavity in some cranial bones is also called a sinus. [23–1297–]

sinus

[′sī·nəs]
(biology)
A cavity, recess, or depression in an organ, tissue, or other part of an animal body.

sinus

1. Anatomy
a. any bodily cavity or hollow space
b. a large channel for venous blood, esp between the brain and the skull
c. any of the air cavities in the cranial bones
2. Pathol a passage leading to a cavity containing pus
3. Botany a small rounded notch between two lobes of a leaf, petal, etc.
4. an irregularly shaped cavity
References in periodicals archive ?
Computed tomography (CT) demonstrated a soft-tissue mass that extended from the nasal cavity to the maxillary and ethmoid sinuses and eroded the lamina papyracea; a bony defect was seen in the floor of the left nasal cavity (figure 2).
At baseline, 60% (n = 18) of this study cohort showed CT evidence of maxillary sinus disease only, while 40% (n = 12) also presented with partial or complete opacification of the anterior ethmoid sinuses.
The author describes a case of prostatic adenocarcinoma that metastasized to the frontal and ethmoid sinuses in a 68-year-old man.
CT also revealed irregular erosion of the lateral wall of the ethmoid sinuses and the posterior wall of the frontal sinus.
Some associated opacification was seen in the right frontal sinus, the right ethmoid sinuses, the left anterior and middle ethmoid sinuses, and both maxillary antra (figure 1, B and C).
In terms of tumor site, most sinonasal NECs and sinonasal undifferentiated carcinomas occur in the same sites as do olfactory neuroblastomas--that is, in the superior nasal cavity, the superior turbinate, and the ethmoid sinuses.
Computed tomography (CT) of the sinuses demonstrated opacification of the left maxillary and ethmoid sinuses and the soft tissue that extended into the left nasal cavity (figure, A).
CT also confirmed the deviation of the nasal septum, and it demonstrated opacification of the left maxillary sinus and the anterior and posterior ethmoid sinuses.
Computed tomography (CT) in both axial and coronal planes identified an expansile soft-tissue-density mass that was confined to the left sphenoid and ethmoid sinuses with foci of calcification that had displaced the globe anterolaterally secondary to the extension of the mass through the medial wall of the orbit (figure 1).
CT also demonstrated a complete opacification of the maxillary sinuses and a partial opacification of the ethmoid sinuses (figure 1, C).