arachnoidal granulations

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Related to Arachnoid granulations: arachnoid trabeculae

arachnoidal granulations

[¦a‚rak¦nȯid·əl ‚gran·yə′lā·shənz]
(anatomy)
Projections of the arachnoid layer of the cerebral meninges through the dura mater. Also known as arachnoid villi; Pacchionian bodies.
References in periodicals archive ?
Transverse sinus, sigmoid sinus and jugular bulb can normally show asymmetric signal intensity and enhancement and is more frequent on left due to compressive effect of left brachiocephalic vein during respiratory cycle.21 Arachnoid granulations are normal structures that protrude into the dural sinus lumen or lateral lacunae.
[11] suggests that some arachnoid granulations that have failed to find venous terminations during embryonic development may penetrate the dura mater.
The presence of preexisting arachnoid granulations facilitates the formation of brain herniation into the dural venous sinus (DVS) or adjacent calvarium.
postulated that blood clots play the initial role in triggering hypersecretion of CSF and fibrosis of arachnoid granulations, leading to long-term communicating HCP rather than merely aqueduct obstruction or stenosis [19].
Arachnoid granulations, especially large ones within the transverse and sigmoid sinuses, are also calcified in middle-aged and older people with characteristic appearances.
Evaluation and management of temporal bone arachnoid granulations. Arch Otolaryngol Head Neck Surg 1992;118(3): 327-32.
These changes were sufficient to inhibit the function of the arachnoid granulations, diminishing CSF resorption with a resulting communicating hydrocephalus.
Transependymal drainage of CSF, followed by medullary venous drainage, supervenes as arachnoid granulations are not fully matured in the neonate.
Acquired encephaloceles occur as a result of chronic ear disease, aberrant arachnoid granulations, trauma, and iatrogenic causes.
Arachnoid granulations simulating osteolytic lesions of the calvarium.
Spontaneous CSF temporal bone leakage might occur as a result of an encephalocele or secondary to the development of arachnoid granulations along the tegmen of the middle ear or mastoid.