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Rare anatomical variation in transverse sinuses (duplication on right, hypoplasia of left) falsely mimicking transverse sinus thrombosis probably due to resultant slow flow
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  1. Naresh Monigari1,
  2. Anirudda Deshpande2,
  3. Veena Vedartham1,
  4. Murali Nalabothu1
  1. 1Department of Medicine, Kasturba Medical College Hospital, Manipal, Karnataka, India
  2. 2Department of Neurology, Kasturba Medical College Hospital, Manipal, Karnataka, India
  1. Correspondence to Dr Anirudda Deshpande, dr.aniruddha.deshpande{at}gmail.com

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Description

We report the case of a 30-year-old, 2 weeks postpartum female, with a history of right temporal headache, intermittent, holocranial in nature, moderate intensity with associated nausea and vomiting when headache was severe. Symptoms were worse since the past 10 days. Neurological examination including funduscopy was unremarkable. A probable diagnosis of transformed migraine without aura was made; however, in view of the new onset headache during postpartum status MRI of the brain was performed to rule out the possibility of cortical venous thrombosis. MRI of the brain showed the absence of flow void in the right transverse sinuses (figure 1), MR venogram showed normal filling of the entire venous system. However, there was a presence of bifid transverse sinus on the right side, hypoplastic left sinus with normal flow-related enhancement on the left side (figures 24). This was a rare incidental finding. Hypoplasia of the left transverse sinus is a well-known anatomical variation. Two previous studies showed the incidence of left hypoplastic sinus to be 24%1 and 31%2 of normal asymptomatic population on MR venography. Duplication of right transverse sinus is seen in our patient which to the best of our knowledge has not been reported previously.

Figure 1

Brain MRI T1-weighted coronal sequence showing the absence of flow void in right transverse sinus.

Figure 2

MR venography demonstrating the duplication of right transverse sinus with hypoplastic left transverse sinus.

Figure 3

MR venography demonstrating the duplication of right transverse sinus with hypoplastic left transverse sinus.

Figure 4

MR venography demonstrating the duplication of right transverse sinus with hypoplastic left transverse sinus.

We postulate that the bifid transverse sinus may slow the venous flow in the transverse sinus and this may give rise to a false MRI finding of absent flow void in the same, hence mimicking transverse sinus thrombosis. This is all the more logical in this case as left transverse sinus is hypoplastic on the left side therefore making the right transverse sinus the major path of drainage of venous blood to internal jugular vein.

In view of frequent presence of an asymptomatic dural venous sinus anatomical variation these should be interpreted with caution and should not to be mistaken with cortical sinus thrombosis. The patient was treated for transformed migraine with topiramate with which she showed significant improvement in her symptoms.

Learning points

  • Duplication of transverse sinus is a rare congenital abnormality.

  • It may mimic transverse sinus thrombosis probably as a result of slow flow.

  • Duplication is a rare normal anatomical variation of transverse sinus, which may or may not be associated with hypoplasia of the other side.

Acknowledgments

The authors would like to thank Dr Suryanarayan Rao, Professor and Head, Department of Neurology, Kasturba Medical College, Manipal, Karnataka, India.

References

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Footnotes

  • Contributors NM made substantial contributions to the conception or design of the work, acquisition, analysis and interpretation of the data. AD and VV were involved in drafting the manuscript or revising it critically for important intellectual content. MN and VV approved the final version to be published.

  • Competing interests None.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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