This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
In herpes encephalitis, all of the following are true, except 
Select and explain. 
A. Focal symptoms common, B. Temporal lobe involved, C. MRI is diagnostic, D. CT scan better than MRI
D: CT scan better than MRI
Answer: D: CT scan better than MRI 
Explanation: Harrison&;s principles of internal medicine 17 th edition. *Focal finding in patient with encephalitis should always raise the possibility of HSV encephalitis .examples of focal findings include(1) areas of increased signal intensity in the frontotemporal ,cingulate or insular region of brain on T2 weighted,FLAIR or diffuse weighted MRI images (2)focal areas of low absorption on mass effect and contrast enhanced on CT (3)periodic focal temporal lobes spikes on background of slow flattened activity on EEG *80%cases have abnormality in temporal lobe *CT is less sensitive than MRI.