Several cystic lesions may involve the temporal lobe including arachnoid, choroidal fissure and juxta-sylvian cysts. We reported a case of appearance, increase and spontaneous disappearance of a juxta-sylvian cyst in a young girl with headache studied by MRI between 1990 and 2003. In agreement with previous reports, the sudden disappearance, without a history of trauma, could be the result of an osmotic effect that shifted CSF inside the cyst, leading to an increase in osmotic pressure and rupture of the cyst wall.
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