Abtract
The dichotomy of the cingulum bundle into the dorsal supracallosal and ventral parahippocampal parts is widely accepted; however, the retrosplenial component with its multiple alternative connections has not been revealed. The aim of this study was to delineate the microsurgical anatomy of a connectionally transition zone, the isthmic cingulum, in relation to the posteromedial interhemispheric access to the atrium and discuss the relevant patterns of glioma invasion on the basis of its fiber connections. White matter (WM) fibers were dissected layer by layer in a medial-to-lateral, lateral-to-medial, and posterior-to-anterior fashion. All related tracts and their connections were generated using deterministic tractography. The magnetic resonance imaging (MRI) tractography findings were correlated with those of fiber dissection. A medial parieto-occipital approach to reach the atrium was performed with special emphasis on the cingulate isthmus and underlying WM connections. The isthmic cingulum, introduced as a retrosplenial connectional crossroad for the first time, displayed multiple connections to the splenium and the superior thalamic radiations. Another new finding was the demonstration of lateral hemispheric extension of the isthmic cingulum fibers through the base of the posterior part of the precuneus at the base of the parieto-occipital sulcus. The laterally crossing cingulum fibers were interconnected with three distinct association tracts: the middle longitudinal (MdLF), the inferior frontooccipital fasciculi (IFOF), and the claustro-cortical fibers (CCF). In the process of entry to the atrium during posterior interhemispheric approaches, the splenial and thalamic connections, as well as the laterally crossing fibers of the isthmic cingulum, were all in jeopardy. The connectional anatomy of the retrosplenial area is much more complicated than previously known. The isthmic cingulum connections may explain the concept of interhemispheric and medial to lateral cerebral hemisphere invasion patterns in medial parieto-occipital and posteromesial temporal gliomas. The isthmic cingulum is of key importance in posteromedial interhemispheric approaches to both: the atrium and the posterior mesial temporal lobe.
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10 August 2023
A Correction to this paper has been published: https://doi.org/10.1007/s10143-023-02110-4
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TS: cadaver dissections, conducted the study method, literature search, collected the data, writing the manuscript, revised the manuscript, and final approval; RA: cadaver dissections, revised the manuscript, and final approval; OzB: cadaver dissections, revised the manuscript, and final approval; ZD: cadaver dissections, revised the manuscript, and final approval; OgB: collected the data, revised the manuscript, and final approval; OH: diffusion tensor imaging and 3D radiologic figures, revised the manuscript, and final approval; AA: diffusion tensor imaging and 3D radiologic figures, revised the manuscript, and final approval; NT: conceived the idea, study supervision, collected data, revised the manuscript, and final approval.
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Saygi, T., Avyasov, R., Barut, O. et al. Microsurgical anatomy of the isthmic cingulum: a new white matter crossroad and neurosurgical implications in the posteromedial interhemispheric approaches and the glioma invasion patterns. Neurosurg Rev 46, 82 (2023). https://doi.org/10.1007/s10143-023-01982-w
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DOI: https://doi.org/10.1007/s10143-023-01982-w