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Background: Intraventricular lesions present a surgical challenge because of the complexity of the ventricular anatomy, various perforating arteries, and eloquent brain areas surrounding the system. The ventricular atrium is particularly challenging because of the cingulate gyrus, corpus callosum, optic pathways, and significant vascular structures. We present the case of a patient for whom we used a new surgical approach to reach a lesion in the ventricular atrium. Case Report: A 26-year-old male presented with an intraventricular hemorrhage, acute hydrocephalus, and a grade III arteriovenous malformation (AVM) in the atrium of the left lateral ventricle. We approached the AVM through a posterior parietooccipital paracallosal interhemispheric approach. Instead of transecting the cingulate cortex as is traditionally done, we gently retracted the cingulate gyrus and made a small paracallosal incision to reach the atrium of the left lateral ventricle. The surgery was uneventful. The patient recovered well and was discharged home on postoperative day 3 without any deficits. Conclusion: This case illustrates a novel variation to an established approach to the ventricular atrium. With this technique, the surgeon minimizes disruption of brain tissue and thereby avoids the associated postoperative deficits associated with traditional approaches (transcortical, transcingulate, and conventional transcallosal). Tractography studies and a large cohort of patients are necessary to ensure the reproduction of good outcomes.

Interhemispheric Paracallosal Approach for an Arteriovenous Malformation of the Atrium: A Novel Technique