Arachnoid cyst - middle cranial fossa

Case contributed by Ammar Haouimi


Increased head circumference with frontal bossing.

Patient Data

Age: 5 months
Gender: Male

Large extra-axial cystic lesion of right middle cerebral fossa, extending to the insular region eliciting an isointense signal to the CSF signal on all sequences with no restricted diffusion. A mass effect is noted on the temporal and frontal lobes.

Benign enlargement of the subarachnoid space at the frontal and anterior interhemispheric regions with dilated ventricular system.

Case Discussion

MRI features of a large arachnoid cyst of the middle cranial fossa extending to the insular region, type III according to Galassi classification.

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