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FIG 1. A noncontrast CT shows a well-circumscribed and rounded high-attenuation area in the left Sylvian fissure without clearly defined mass effect. This image depicts a thin crescent of surrounding CSF.FIG 2. A noncontrast CT scan obtained 4 years prior to the current admission shows an arachnoid cyst in the left middle cranial fossa, without coexistence of the above-shown hyperattenuating finding
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