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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.
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(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)
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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–]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A cavity, recess, or depression in an organ, tissue, or other part of an animal body.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Although the main role of neuro-imaging in IIH is to exclude other pathologies that cause increased CSF pressure, MRI findings that can be detected by modern neuroimaging methods such as empty sella, tortuosity of optic nerve, flattened posterior globe/sclera, contrast enhancement of vessels in the optic disc, meningocele formation, diffusion restriction at the optic nerve head, and transverse sinus stenosis were found to be related to diagnosis (13).
A divider is inserted past the craniotomy in such a manner that one limb just touches the upper margin of proximal transverse sinus (Fig.
3D TOF sequence (RM venography)--Arrows demonstrate the absence of flow at the level of transverse sinus on a distance of 30 mm in the middle third portion, close to the sinus confluence
Right transverse sinus was hypoplastic in 8(3.92%) patients, and of them 2(25%) were found in males and 6(75%) in females.
In this case, we chose conservative treatment (tumor subtotal resection and skin flap grafting), considering the presence of the occipital defect with transverse sinus bulging and the history of recurrence after surgery.
Intracranial hypertension promotes the collapse of the transverse sinus resulting in increased venous pressure and impairment of passive CSF resorption (Figure 4).
Caption: Figure 3: MRV brain with contrast shows non opacification of the left transverse sinus due to underline deep venous sinus thrombosis
Vertebral osteomyelitis in high cervical segments such as the odontoid process can spread to adjacent soft tissue resulting in adherence of fibrin, blood, and platelets producing thrombosis which can extend intracranially into the sigmoid and transverse sinus as in our patient.
In the literature, the most and the second most common localizations of CVT have been reported as superior sagittal and transverse sinus in CVT patients with BD.
Magnetic resonance venography (MRV) demonstrated right sigmoid and transverse sinus thrombosis, right proximal internal jugular vein thrombosis, and bilateral cavernous sinus thrombosis (figure 2).
The thrombosed (hyperdense) right transverse sinus was misinterpreted as a subdural hematoma.
Under aseptic conditions, midline marked, question mark incision started at zygoma, with posterior extent 2-3 cm posterior to standard trauma flap taking care of transverse sinus and torcula.

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