This site is targeted at medical and radiology professionals, contains user contributed content, and material that may be confusing to a lay audience. Use of this site implies acceptance of our Terms of Use.

Empty delta sign

The empty delta sign is CT sign of dural venous sinus thrombosis of the superior sagittal sinus, where contrast outlines a triangular filling defect (clot). It is only described with contrast-enhanced CT-scan or MRI, not with NECT nor non-contrast MRI.

The exact mechanism for this appearance is uncertain, with possibilities including:

  • recanalisation around an organising clot
  • enlargement of the peri-dural small veins: a vascular mesh (dural cavernous spaces), and meningeal venous tributaries
  • thickening of the dura with increased enhancement

Updating… Please wait.
Loadinganimation

 Details successfully updated.

Error Unable to process the form. Check for errors and try again.

 Thank you for updating your details.