PMC2760907_01
(A) MRI showing large posterior fossa archnoid cyst. (B) MRI showing posterior fossa archnoid cyst causing compression of adjacent structures
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MRI scan showed a large posterior fossa arachnoid cyst in midline with a dimension of 3.2 cm x 4.7cm x 3.6 cm causing severe compression over the cerebellar vermis [Figures 1A and B].
Post operative CT sacn with shunt in situ
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Repeat CT scan [Figure 2] showed the shunt tube in situ in posterior fossa, with regression in size of the cyst and hydrocephalous as compared to the previous study.