A Novel Interhemispheric Dural Inversion Technique for Indirect Parafalcine Cerebral Revascularization: Case Report.

Background and importance: Variety of revascularization strategies have been deployed to treat the deterioration of cerebral blood flow. Blood flow restoration can be achieved by direct or indirect procedures. The indirect reconstructive procedure to augment blood flow involves encephalomyosynangiosis, encephaloduroarteriosynangiosis, or encephalodurosynangiosis, and has been used effectively in ischemic Moyamoya disease. However, the preferred procedure must be evaluated on a case-by-case basis and remains controversial in other cerebral arterial diseases. Here, we report the "interhemispheric dural inversion (IDI)" as a novel technique for indirect parafalcine cortical revascularization.

Clinical presentation: A 54-year-old white man with a complex history of neck radiation secondary to childhood Hodgkin's lymphoma presented with focal perfusion deficit in the right mesial occipital lobe near the primary visual cortex. A large c-shaped dural flap with a paramedian base is harvested and, after an interhemispheric dissection, placed in contact with the ischemic parafalcine cortical tissue (IDI).

Conclusion: The IDI was used successfully for indirect revascularization of a focal right paramedian occipital lobe deficit in a 54-year-old man with complex cerebro-occlusive disease from childhood radiation and multiple previous bypass surgeries. The IDI is a simple approach for targeted indirect parafalcine cortical revascularization to facilitate an increased blood supply and prompt new vessels to sprout from preexisting dural arteries. It can be used as a standalone technique or combined with other revascularization strategies, as warranted.