arachnoid villi

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arachnoid villi

[ə′rak‚nȯid′vil·ē]

(anatomy)

arachnoidal granulations

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arachnoidal granulations

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Defects may be congenital or due to aberrant arachnoid granulations [3, 8].

Repair of Tegmen Tympani Defect Presenting with Spontaneous Cerebrospinal Fluid Otorrhea Using the Middle Cranial Fossa Approach

[14] described a focal brain herniation into a giant arachnoid granulation located in a DVS which may have developed spontaneously or was induced by elevated intracranial pressure and cerebral edema resulting from prior head trauma.

Brain Herniation into Giant Arachnoid Granulation: An Unusual Case

* According to the other theory, arachnoid granulations that do not get a venous drain during embryonic development come to lie in a blind end against the inner bony surface of the skull.

Spontaneous cerebrospinal fluid leak presenting as unilateral (left-sided) middle ear effusion

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.

Normal variations in cerebral venous anatomy and their potential pitfalls on 2D TOF MRV examination: Results from a private tertiary care hospital in Karachi

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].

Hydrocephalus after Subarachnoid Hemorrhage: Pathophysiology, Diagnosis, and Treatment

Arachnoid granulations, especially large ones within the transverse and sigmoid sinuses, are also calcified in middle-aged and older people with characteristic appearances.

Intracranial calcifications

Communicating hydrocephalus is caused by diminished resorption of CSF at the arachnoid granulations, leading to an expansion of both the ventricular system and the subarachnoid space.

Communicating Hydrocephalus in a Mature Goffin's Cockatoo (Cacatua goffini)

Transependymal drainage of CSF, followed by medullary venous drainage, supervenes as arachnoid granulations are not fully matured in the neonate.

A severe case of astrogliosis and encephalomalacia in a neonate with a massive vein of Galen malformation (VGM)

Acquired encephaloceles occur as a result of chronic ear disease, aberrant arachnoid granulations, trauma, and iatrogenic causes.

Encephalocele

Arachnoid granulations simulating osteolytic lesions of the calvarium.

Radiological case of the month: Baha Al-Shawwa, MD and Mutasim Abu-Hasan, MD

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.