subarachnoid space


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Related to subarachnoid space: Subarachnoid hemorrhage

subarachnoid space

[¦səb·ə′rak‚nȯid ¦spās]
(anatomy)
The space between the pia mater and the arachnoid of the brain.
References in periodicals archive ?
When a dermoid tumor ruptures, fat droplets--appearing hypodense on CT or Tl hyperintense on MRI--may be seen scattered and floating within the nondependent portions of the ventricular system and/or subarachnoid space.
a CSF-filled cleft lined by grey matter extending from the subarachnoid space from the right parietal lobe region communicating with the trigone and occipital horns of the right lateral ventricle
The cochlear aqueduct, which connects the perilymphatic space to the CSF-filled subarachnoid space, influences the relationship between low CSF pressure and hearing impairment.
4) In one of our cases (patient 1), there was upper cervical spine involvement with a soft tissue component extending to the anterior subarachnoid space.
The subarachnoid space was dilated from the C2 through the C7 level and it was completely obliterated at the C2 level.
With time, the pressure of CSF from the subarachnoid space supposedly causes erosion through the fibrous covering of the arachnoid granulation.
1) This is well known to be related to the inflammatory reaction within the subarachnoid space in patients with cysticercotic arachnoiditis, independent of the stage of the infection, and that is the reason why patients with hydrocephalus due to cysticercotic arachnoiditis frequently have a poor prognosis, since the mortality in these patients is directly related to the number of surgical interventions done to replace the shunt.
Subarachnoid hemorrhage (SAH) occurs when blood suddenly enters the subarachnoid space, usually from the rupture of a cerebral aneurysm.
The obstructive effects result from blockage of the cerebrospinal fluid (CSF) circulation by cysticerci located in the ventricles or the subarachnoid space.
Study findings support an opposite, outside-in process: from the cerebrospinal fluid-filled subarachnoid space, that cushions the outside of the brain and the cortex, into the white matter.
These are then injected into the subarachnoid space with the local anaesthetic solution (1,2).
10) According to this theory, clefts in the cyst wall allow fluid to enter the cyst from the subarachnoid space, but since the fluid cannot regress, cystic expansion occurs.