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The relationship of transverse sinus stenosis to bony groove dimensions provides an insight into the aetiology of idiopathic intracranial hypertension

  • Diagnostic Neuroradiology
  • Published:
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Abstract

Introduction

Transverse sinus tapered narrowings are frequently identified in patients with idiopathic intracranial hypertension (IIH); however, it remains unclear whether they are primary stenoses or whether they occur secondary to raised cerebrospinal fluid pressure. Computed tomographic venography demonstrates both the morphology of the venous system and the adjacent bony grooves so it may provide an insight into the aetiology of these transverse sinus stenoses.

Materials and methods

Tapered transverse sinus narrowings (>50%) were studied in 19 patients without IIH and 14 patients with IIH. Computed tomography vascular studies were reviewed and the dimensions of the venous sinuses and bony grooves at the sites of maximum and minimum transverse sinus area dimensions were recorded.

Results

There was demonstrated to be a strong correlation of bony groove height with venous sinus height at the largest portions of the transverse sinus in both IIH patients and non-IIH subjects as well as at the transverse sinus narrowing in non-IIH subjects. There was a discordant relationship between bony groove height and venous sinus height at the site of transverse sinus stenoses in IIH patients. In 5/23 IIH transverse sinus stenoses, the bony groove height was proportionate to that seen in non-IIH subjects. There were a further 8/23 cases where the small or absent sinus was associated with an absent bony groove.

Conclusion

Transverse sinus tapered narrowings in subjects without IIH and in the majority of patients with IIH were associated with proportionately small or absent grooves, and these are postulated to be primary or fixed. Some patients with IIH demonstrate tapered transverse sinus stenoses with disproportionately large bony grooves, suggesting a secondary or acquired narrowing. This implies a varied aetiology for the transverse sinus stenoses of IIH.

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Conflict of interest statement

We declare that we have no conflict of interest.

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Authors and Affiliations

  1. Neuroradiology Department, Ruskin Wing, King’s College Hospital, Denmark Hill, London, SE5 9RS, UK

    S. E. J. Connor, V. R. Stewart & E. A. M. O’Flynn

  2. Institute of Neurological Sciences, Southern General Hospital, Glasgow, G51 4TF, Scotland

    M. A. Siddiqui

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  1. S. E. J. Connor
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  2. M. A. Siddiqui
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  3. V. R. Stewart
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  4. E. A. M. O’Flynn
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Correspondence to S. E. J. Connor.

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Connor, S.E.J., Siddiqui, M.A., Stewart, V.R. et al. The relationship of transverse sinus stenosis to bony groove dimensions provides an insight into the aetiology of idiopathic intracranial hypertension. Neuroradiology 50, 999–1004 (2008). https://doi.org/10.1007/s00234-008-0431-5

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  • DOI: https://doi.org/10.1007/s00234-008-0431-5

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