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Citation:
Marsh P, Bell D, Deng F, et al. Trigone of the lateral ventricle. Reference article, Radiopaedia.org (Accessed on 27 Mar 2025) https://doi.org/10.53347/rID-62538
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.
Which numbered arrow indicates the trigone (atrium) of the lateral ventricle?
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1. Albert L. Rhoton, Jr.. Rhoton's Cranial Anatomy and Surgical Approaches. (2019) ISBN: 9780190098520
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2. Stratchko L, Filatova I, Agarwal A, Kanekar S. The Ventricular System of the Brain: Anatomy and Normal Variations. (2016) Seminars in ultrasound, CT, and MR. 37 (2): 72-83. doi:10.1053/j.sult.2016.01.004 - Pubmed
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3. Jelinek J, Smirniotopoulos JG, Parisi JE, Kanzer M. Lateral ventricular neoplasms of the brain: differential diagnosis based on clinical, CT, and MR findings. (1990) AJNR. American journal of neuroradiology. 11 (3): 567-74. Pubmed
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