A 26-year-old postpartum woman presents with severe headache and a focal seizure. Non-contrast CT shows hyperdensity along the superior sagittal sinus. On contrast-enhanced MRI, the postcontrast T1 images show a filling defect within the enhanced triangular dural convexity at the torcular region. This sign is called:

• A Empty delta sign ✓
• B Delta sign of temporal bone fracture
• C Epsilon sign
• D Cord sign

Explanation

The empty delta sign describes enhancement of the dural margins of the superior sagittal sinus surrounding a central non-enhancing thrombus, seen on contrast-enhanced CT or MRI in dural venous sinus thrombosis. The cord sign refers to a hyperdense thrombosed cortical vein, not the sinus itself, and the epsilon sign is used for epidural haematoma on skull radiographs.

Reference: Osborn's Brain, 2nd ed.

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Written and medically reviewed by the StethoPrep medical team.