Abdominal & Neuro Imaging · NEET PG Preparation Radiology
A 35-year-old female presents with acute onset of severe headache followed by generalized tonic-clonic seizures. Non-contrast CT of the brain shows a…
Practice question from Abdominal & Neuro Imaging (NEET PG Preparation Radiology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-328FB2
A 35-year-old female presents with acute onset of severe headache followed by generalized tonic-clonic seizures. Non-contrast CT of the brain shows a hyperdense triangle sign along the superior sagittal sinus. Magnetic resonance venography (MRV) confirms absence of flow within the superior sagittal sinus. Which condition does this finding pathognomonically indicate?
- A.Subarachnoid hemorrhage
- B.Cerebral venous sinus thrombosisCorrect answer
- C.Sagittal meningioma
- D.Arteriovenous malformation
Solution
The 'hyperdense triangle sign' (or dense triangle sign) on a non-contrast CT scan of the brain is a classic acute sign of cerebral venous sinus thrombosis (CVST), representing acute thrombus within the superior sagittal sinus. MR venography confirms the filling defect or lack of flow.
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