This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
IOC for subarachnoid hemorrhage: September 2011 
Select and explain. 
A. MRI, B. NCCT, C. USG, D. X-ray skull
B: NCCT
Answer: B: NCCT 
Explanation: Ans. B: NCCT Radiological signs in CNS: Bracket calcification: Corpus callosum lipoma (skull) Basal ganglia calcification: Hypoparathyroidism Suprasellar calcification: - Craniopharyngioma - Meningioma Rail road/ Tram track calcification: Sturge Weber syndrome Periventricular calcification: CMV infections Separation of sutures: Sign of raised intracranial tension in a child