Spontaneous arachnoid cyst rupture with subdural hygroma

Case contributed by Dr Ammar Haouimi


One week history of Headaches and nausea. No history of trauma.

Patient Data

Age: 5 years
Gender: Female

There is an extra-axial cystic lesion of CSF signal on all sequences, filling the middle cranial fossa and extending along the Sylvian fissure with thinning of the adjacent bones and mass effect with displacement of temporal and frontal lobes. Note a left hemispheric crescent-shaped fluid collection of CSF signal within the subdural space (subdural hygroma) with no midline shift.

Case Discussion

MRI features of an arachnoid cyst of the middle cranial fossa type III (Galassi classification) ruptured into the subdural space, causing a subdural hygroma.

Arachnoid cysts within the brain are common in children but its rupture within the subdural space is relatively rare. It's usually the result of a tear of the arachnoid membrane (due to trauma, surgical manipulation, or rarely spontaneous) with an accumulation of CSF fluid within the subdural space.

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Case information

rID: 64214
Published: 10th Nov 2018
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included
Institution: Aurès Medical Imaging Center - Batna Algeria

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