The vein of Galen is a short (1-2cm long), thick vein that passes posterosuperiorly behind the splenium of corpus callosum in the quadrigeminal
Radiological parameters noted were midline shift, types of intracranial haemorrhage such as epidural haematoma, subdural haematoma, intracerebral haematoma, fracture and diffuse brain injury, area of brain involved, status of total 9 cisterns (Interpeduncular, two crural, two ambient, Quadrigeminal
, sellar and two Sylvian cistern) whether opened or closed.
On MR angiography, the internal cerebral vein and the vein of Galen were observed to be dilated and an arteriovenous malformation (AVM) was noted originating from the interpeduncular cistern extending into the quadrigeminal
cistern and lateral ventricle, nourished by the posterior cerebral artery, draining into the internal cerebral vein and vein of Galen.
There was no evidence of any compression of the quadrigeminal
plate cistern or fourth ventricle on imaging.
Brain computed tomography (CT) and magnetic resonance imaging (MRI) showed right cystic lesion rising from the quadrigeminal
cistern on the left side and extending supratentorially, indenting the third ventricle causing obstructive hydrocephalus.
cyst management by cystoperitoneal shunt in a 4-year-old Persian cat.
While hyperintensity is seen in medial thalamic and periacuaductal gray matter on T2 and FLAIR sequences of cranial Magnetic Resonance Imaging (MRI) in acute cases, atrophy in mamillary bodies, enhanced signaling in the base of fourth ventricle, midline of cerebellum may be seen in chronic cases and contrast enhancement may occur in mamillary bodies and inferior quadrigeminal
The posterior cerebral artery (PCA) is divided into four segments: P1 (precommunicating segment), P2 (postcommunicating segment), P3 (quadrigeminal
segment), and P4 (calcarine segment).
The pericallosal region as well as the quadrigeminal
and suprasellar cisterns is the common location for intracranial lipomas.
Contraindications to lumbar puncture [7-9] * Major contraindication is raised intracranial pressure * Focal neurological deficit * Papilloedema * Significantly altered level of consciousness * Computed tomography (CT) findings * lateral midline shift * loss of suprachiasmatic or basal cisterns * fourth ventricle effacement * obliteration of supracerebellar or quadrigeminal
plate cisterns with patent ambient cisterns * Presence of local infection at lumbar puncture site * Coagulopathy * Thrombocytopenia (platelet count <50 000)
Characteristic imaging appearances of asymmetric narrowing of the internal carotid arteries (especially the supraclinoid portion) with numerous collateral vessels around the brainstem, especially within the ambient and quadrigeminal
plate cisterns, are demonstrated with progression.
Because patients are usually scanned in the supine position, particularly important locations include the interpeduncular cistern, the occipital horns of the lateral ventricles, the quadrigeminal
plate cistern, and the dependent portions of the Sylvian fissures (Figure 1).