=====Atrium=====

see also [[hearth atrium]].

AKA: [[Trigone]]

The junction of the temporal horn, the occipital horn, and the lateral ventricle's posterior body is called the atrium. The trigone region is the floor of this area where the temporal and occipital horns unite.

The trigone of the [[lateral ventricle]] is a triangular area defined by the [[temporal horn]] inferiorly, the [[occipital horn]] posteriorly, and the body of the lateral ventricle anteriorly.

Knowledge of the microsurgical [[anatomy]] of the atrium of the [[lateral ventricle]] and surrounding vital structures and the choice of an appropriate surgical [[approach]] will help surgeons perform safe and [[minimally invasive surgery]]
((Kawashima M, Li X, Rhoton AL Jr, Ulm AJ, Oka H, Fujii K. Surgical approaches to the atrium of the lateral ventricle: microsurgical anatomy. Surg Neurol. 2006  May;65(5):436-45. PubMed PMID: 16630901.)).

[[Ventriculomegaly]] is a brain condition that occurs when the [[lateral ventricle]]s become dilated. The most common definition uses a width of the [[atrium]] of the lateral ventricle of greater than 10 mm.

====Atrium lesions====
see [[Trigone tumor]].