Intracranial arachnoid cyst - huge

Case contributed by Dr Dalia Ibrahim


History of trauma, CT to exclude cranial injury.

Patient Data

Age: infant
Gender: Male

CT Brain

Giant arachnoid cyst in the left middle cranial fossa which extends almost to the vertex, it significantly compresses the left cerebral hemisphere, with contralateral midline shift.

It significantly compresses the left lateral ventricle, it also compresses the right foramen of Monro with subsequent moderate asymmetrical right hydrocephalic changes.

No significant bone remodeling of the adjacent calvarail bones.

The lesion is isodense to the CSF, with no evidence of fresh blood density within.   

Case Discussion

Type III according to Galassi classification.

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Case information

rID: 42086
Published: 5th Jan 2016
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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