Delta-sign is seen in ?
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.
Petrositis
Acute mastoiditis
Sigmoid sinus thrombosis
Glomus tumor