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Tag Archives: DWI
Educational Presentation: DWI of Brain Abscesses
We are back from RSNA and it is time to post a new educational activity in our blog. This presentation, by one of our previous neuroradiology fellows, addresses the typical and atypical findings and utility of DWI in the evaluation of brain abscesses.… Continue reading >>
Posted in Educational Presentations
Tagged diffusion study; Echo-Planar Imaging, DWI, Education
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Aunt Mickey (They Look the Same until You Undress Them). Lhermitte-Duclos or Something Else?
A young man presented with ataxia. Brain contrast enhanced MRI was done including DWI and perfusion. T2WI showed a mixed intensity lesion in the inferior right cerebellar hemisphere which contained some “dark stripes”. DWI ADC map show restricted diffusion centrally. After contrast the lesion enhanced in a striped fashion and perfusion showed low rCBV (see below). Llermitte-Duclos disease was considered in the differential diagnosis.
Further questioning of patient disclosed that the symptoms had had a sudden onset 7 days earlier. The diagnosis of subacute infarction of the right posterior inferior cerebellar artery territory was considered as the most likely cause … Continue reading >>
ADC Question
I will like to know if someone can help me with some doubts I have regarding ADCs.
1. I have a sample with some ADC values obtained in 1,5 T and others obtained in 3T ( same b value). Can I use the ADC values for statistics or do you think that they cannot be compared?
2. Are the ADC values obtained using a diffusion sequence the same that the ADC values obtained in a DTI sequence with 12 directions?
Thank you in advance.… Continue reading >>
RE: DWI for Head and Neck Lesions – Acute Ischemic Optic Neuropathy
Here’s another case for the value of DWI for head and neck lesions.
This patient had left central retinal artery occlusion and acute ischemic optic neuropathy. There is restricted diffusion in the anterior left optic nerve which is much more obvious than the mild perineural enhancement on coronal postcontrast images.
