Middle cranial fossa arachnoid cyst (Galassi type II)

Case contributed by Dr Hidayatullah Hamidi

Presentation

Sometimes headache

Patient Data

Age: 10-year-old
Gender: Male

A large, well defined, CSF signal intensity lesion in the right middle cranial fossa displacing the temporal lobe posteriorly. There is no restricted diffusion, no solid component, no enhancement, no haemorrhage or calcification.

No adjacent infiltrative or inflammatory changes.

Features are characteristic of an arachnoid cyst. (Galassi type II)

Case Discussion

Intracranial arachnoid cysts more frequently occur in the middle cranial fossa. They have characteristic Features on MR imaging. Their differentiation with epidermoid cysts can mainly be done on diffusion weighted images. Galassi classification is still widely used classification for middle cranial fossa arachnoid cysts.

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Case information

rID: 55961
Case created: 3rd Oct 2017
Last edited: 25th Oct 2017
Inclusion in quiz mode: Included
Institution: French Medical Institute for Mothers and Children

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