system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Delta-sign is seen in ?
assistant
The correct answer is  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.