The incisural line is a midsagittal line connecting the Galenic venous confluence point (which includes the internal cerebral veins, the mesencephalic veins, and the basal veins of Rosenthal) with the base of the dorsum sella 1.
It is a fixed anatomically based line of reference at the tentorial hiatus separating the supratentorial from infratentorial structures. Therefore, it is essential in central incisural herniation specially intracranial hypotension ref.
It is usually used with the tuberculum-venous confluence line as references lines to assess if there is central incisural herniation or no ref.
The mamillary body, iter (the porus of the cerebral aqueduct), and the splenium of corpus callosum should be above these lines, if inbetween or below, it indicates central incisural herniation 1.
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