quadrigeminal cistern

qua·dri·gem·i·nal cis·tern

[TA]
an enlarged portion of the subarachnoid space located immediately superior to the tectum of the mesencephalon; may extend forward between the corpus callosum and thalamus as the cistern of the velum interpositum; contains caudal portions of the internal cerebral veins as they join to form the great cerebral vein (of Galen), distal parts of the quadrigeminal artery, the P4 segment of the posterior cerebral artery, and the exit of the trochlear nerve.
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References in periodicals archive ?
In a study by Galarza et al, the posterior fossa arachnoid cysts were located at the vermis-cisterna magna (n=4), the cerebellar hemispheres (n=2), the cerebellopontine angle (n=3) and the quadrigeminal cistern (n=1).
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.
Dilated arteries drain into a large midline venous pouch in the region of the quadrigeminal cistern.