Case Of the Week (COW) 16 Mar 2014
Answer:
EPIDERMOID CYST IN RIGHT CEREBELLAR REGION WITH LEFT CEREBELLAR REGION ARACHNOID CYST.
Findings:
A well defined mixed density lesion with calcifications noted in the right cerebellar region which shows high signal in T2weighted images and supressed in flair and shows diffusion restriction A well defined csf density lesion which is isointense to csf in T2 weighted images and completely supressed on flair and has high ADC values noted in left cerebellar hemisphere causing mass effect over the brain stem and fourth ventricle .cysto peritoneal shunt tube noted within it.
Discussion:
Intracranial epidermoid cysts are congenital lesions which account for about 1% of all intracranial tumours . They result from inclusion of ectodermal elements during neural tube closure DWI - useful for differentiation from arachnoid cysts due to increased signal (due to a combination to true restricted diffusion and T2 shine through) which is not seen with arachnoid cysts.
Contributed By:
Dr.Indumathi, Prof.Babupeter, Dr.Geetha
Barnard Institute of Radiology
Answer:
EPIDERMOID CYST IN RIGHT CEREBELLAR REGION WITH LEFT CEREBELLAR REGION ARACHNOID CYST.
Findings:
A well defined mixed density lesion with calcifications noted in the right cerebellar region which shows high signal in T2weighted images and supressed in flair and shows diffusion restriction A well defined csf density lesion which is isointense to csf in T2 weighted images and completely supressed on flair and has high ADC values noted in left cerebellar hemisphere causing mass effect over the brain stem and fourth ventricle .cysto peritoneal shunt tube noted within it.
Discussion:
Intracranial epidermoid cysts are congenital lesions which account for about 1% of all intracranial tumours . They result from inclusion of ectodermal elements during neural tube closure DWI - useful for differentiation from arachnoid cysts due to increased signal (due to a combination to true restricted diffusion and T2 shine through) which is not seen with arachnoid cysts.
Contributed By:
Dr.Indumathi, Prof.Babupeter, Dr.Geetha
Barnard Institute of Radiology