Arachnoid cyst with mass effect

Case contributed by Maxime St-Amant
Diagnosis almost certain

Presentation

Right-sided hemiparesis.

Patient Data

Age: 40 years old
Gender: Female

Large CSF-isodense extra-axial lesion with marked mass effect on the left cerebrum including the precentral and post central gyri with rightward midline shift, compression of the left lateral ventricle and trapped right lateral ventricle.

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