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Comment
. 2021 Apr;42(4):E31-E32.
doi: 10.3174/ajnr.A7098. Epub 2021 Mar 25.

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M Shapiro  1 , K Srivatanakul  2 , E Raz  3 , M Litao  3 , E Nossek  4 , P K Nelson  4
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M Shapiro et al. AJNR Am J Neuroradiol. 2021 Apr.
No abstract available

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Figures

FIG 1.
FIG 1.
Examples of dural venous sinuses/channels similar to those described in our index article. Angiography (A) and MR imaging (B) of same patient, with multiple dural channels in addition to the usual superior sagittal sinus. The additional channels, marked by similar arrows on both angiogram and MR image, are flattened, lens-shaped structures, just like the dural venous channels we describe. C and D, Axial and sagittal MR images of patient with a falcine sinus variant—the same flattened morphology as in A and B. E and F, Morphology of the occipital sinus on a venous digital subtraction injection. G, Typical flattened appearance of tentorial venous sinuses.
FIG 2.
FIG 2.
A and B, Cinematic renderings, highlighting transition points (arrows) between round bridging vein and flattened dural venous channel in 2 different cases. A small fenestration versus arachnoid granulation is present in A (dashed arrow); neither structure would be expected in a bridging vein. Frontal (C) and lateral (D) views of another arachnoid granulation inside a dural venous channel.
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References

    1. Padget DH. The cranial venous system in man in reference to development, adult configuration, and relation to the arteries. Am J Anat 1956;98:307–55 10.1002/aja.1000980302 - DOI - PubMed

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