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
[{'content': 'A patient with vestibular schwannoma is best investigated by which of the following: \nSelect and explain. \nA. SPECT, B. Contrast enhanced CT scan, C. Gadolinum enhanced MRI, D. PET scan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vestibular schwannoma usually arises in VIII cranial nerve of posterior cranial fossa. CT scan will not give clear picture of posterior cranial fossa tumour < 2cm. MRI scan is the investigation of choice in patient with posterior cranial fossa tumour. Ref: Philippe Demaerel, (2001), Chapter 18, "Imaging of Intracranial Abnormalities in Neurofibramatosis type 1 & 2", In the book, "Recent Advances in Diagnostic Neuroradiology", Springer Publications, USA, Page 283', 'role': 'assistant'}]