Trigone of the lateral ventricle

Last revised by Daniel J Bell on 3 Feb 2020

The trigone of the lateral ventricle is an area of the lateral ventricle at the confluence of the occipital and temporal horns. It refers either to the three-dimensional space at the transition between the body of the lateral ventricle and the occipital and temporal horns, in which case it is also known as the atrium (plural: atria), or the triangular floor of this space, in which case it is also known as the collateral trigone 1,2.

Related pathology

The most common neoplasm in this region is intraventricular meningioma in adults and choroid plexus papilloma in children 3.

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