Cerebellopontine angle epidermoid cyst

Case contributed by Dr Hidayatullah Hamidi


Headache, left side poor vision for 4 years.

Patient Data

Age: 40 years
Gender: Male

A large (6.5 x 5.6 x 6.3 cm) extra axial, abnormal signal intensity mass lesion in the left cerebello-puntine angle extending to the foramine magnum inferiorly and to the level of tentorium cerebelli superiorly.

The lesion returns high signal intensity on T2WI, low signal on T1WI and heterogeneous signal on FLAIR images.

Diffusion restriction is noted in the mass lesion.

No dropout signal in T2* GRE images to suggest intra lesional hemorrhage/calcification.

No post contrast enhancement of the lesion or adjacent meninges.

No adjacent inflammatory or infiltrative changes.

This abnormal mass lesion is resulting in compression over the adjacent left cerebellar hemisphere, brain stem and sylvian aqueduct resulting in obstructive moderate hydrocephalus.

Case Discussion

The MR features are characteristic for epidermoid cyst.

The cerebellopontine angle is the most common location for intracranial epidermoid cyst. 

Epidermoid cyst is the third most common cerebellopontine angle mass, after acoustic schwannomas and meningiomas.

    Case contributed by: Dr. Hidayatullah Hamidi and Dr Najibullah Rasouly

    PlayAdd to Share

    Case information

    rID: 56834
    Published: 26th Nov 2017
    Last edited: 14th Aug 2019
    Inclusion in quiz mode: Included

    Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.