Presentation
Presenting history unknown.
Patient Data
On the right, at the junction of the transverse and sigmoid sinus, a laterally projecting diverticulum is present, distal to a focal stenosis secondary to an arachnoid granulation appearing to contain brain tissue. The bony plate between the sinus and the mastoid air cells is intact although in some areas it is markedly thinned.
The pituitary fossa appears partially empty (difficult to assess on axial imaging). Optic nerve sheaths are difficult to assess.
Case Discussion
A diagnosis of idiopathic intracranial hypertension cannot be assumed without a clinical history of headaches or visual field disturbance. However, suggesting a correlation with clinical features of the disorder is worthwhile.
The sigmoid sinus diverticulum is likely secondary to the focal stenosis in the distal transverse sinus, resulting from a high-velocity jet. It is equivalent to arterial post-stenotic dilatation.
Unfortunately, we do not have access to the presenting complaint or whether the patient was complaining of tinnitus.
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