Arachnoid cyst

Case contributed by Pir Abdul Ahad Aziz Qureshi



Patient Data

Age: 20 years
Gender: Female

Large CSF density lesion in the left cerebellopontine angle causing mass effect on the adjacent left middle cerebellar peduncle suggestive of an arachnoid cyst.

Case Discussion

The arachnoid cysts are usually small and asymptomatic. On CT scan they are well-defined masses of CSF density with imperceptible walls and cause mass effect on the adjacent structures. They can also cause scalloping of the adjacent bone.

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