Question:
The delta sign on imaging is seen in which of the following conditions?
The delta sign on imaging is seen in which of the following conditions?
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An empty triangle with rim enhancement on contrast CT points to a thrombosed venous sinus.
Updated On: Jun 24, 2026
- Petrositis
- Acute mastoiditis
- Sigmoid sinus thrombosis
- Glomus tumor
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The Correct Option is C
Solution and Explanation
Step 1: A contrast-enhanced CT scan can demonstrate dural venous sinus thrombosis through the typical delta sign (also called empty delta sign).
Step 2: The sign is a triangular area in the posterior cranial fossa on axial cuts that shows rim (peripheral) enhancement with a central low-density region, corresponding to the clot within the sinus.
Step 3: This appearance indicates thrombosis of the sigmoid or other dural venous sinus, and may also be seen on contrast-enhanced MRI.
Step 4: Petrositis, acute mastoiditis and glomus tumor do not produce the delta sign, so the correct answer is sigmoid sinus thrombosis.
Step 2: The sign is a triangular area in the posterior cranial fossa on axial cuts that shows rim (peripheral) enhancement with a central low-density region, corresponding to the clot within the sinus.
Step 3: This appearance indicates thrombosis of the sigmoid or other dural venous sinus, and may also be seen on contrast-enhanced MRI.
Step 4: Petrositis, acute mastoiditis and glomus tumor do not produce the delta sign, so the correct answer is sigmoid sinus thrombosis.
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