Delta-sign is seen in ?: (A) Petrositis, (B) Acute mastoiditis, (C) Sigmoid sinus thrombosis, (D) Glomus tumor
Answer is C. Ans. is 'c' i.e., Sigmoid sinus thrombosis Contrast-enhanced CT scan can show sinus thrombosis by typical delta-sign. It is a triangular area with rim enhancement, and central low density area is seen in posterior cranial fossa on axial cuts. Delta-sign may also be seen on contrast enhanced M RI.