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Abstract #0261

Fixel-based and tensor analysis of tractography-reconstructed anterior optic pathway in patients with sellar/parasellar tumor

Giovanni Sighinolfi1, Laura Ludovica Gramegna1,2, Alessandro Carrozzi1, Cristiana Fiscone1, Matteo Zoli1,2, Diego Mazzatenta1,2, Claudia Testa2,3, Raffaele Lodi1,2, Caterina Tonon1,2, and David Neil Manners1
1Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy, 2IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy, 3Department of Physics and Astronomy, University of Bologna, Bologna, Italy

Synopsis

Keywords: Tumors, Tractography & Fibre Modelling, Anterior Optic PathwayTumors of the sellar/paraellar region are likely to displace the optic chiasm, making it valuable to study the entire course and microstructural properties of the anterior optic pathway (AOP, including optic nerves, chiasm and optic tracts). We present the first fully automated tractography pipeline to entirely reconstruct the AOP. The pipeline was applied on a group of patients with sellar/parasellar tumors displacing the chiasm, achieving excellent reliability. We also estimated mean diffusivity, fractional anisotropy and fiber density along the AOP, demonstrating alterations in patients compared to controls, which we explain based on chiasmal compression.

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