Arachnoid cysts represent approximately 1% of all lesions occupying the intracranial space. They are most frequently located in the Sylvian fissure, in the cisterna magna, or over the hemisphere convexity. An entirely intracerebral arachnoid cyst is rare. A 37-year-old male presented with 1 year duration of numbness and 3 months duration of progressive weakness in his left limbs, associated with headache and nausea. Neurologic examination revealed grade 4/5 motor power and impaired superficial and deep sensations of the left limbs. Babinski sign was positive on the left side. The rest of the physical examination was essentially normal. The patient was initially evaluated by contrast-enhanced computed tomography, which showed a large cystic hypodense area in the right frontal and parietal lobes without the enhancement of the cyst wall or perilesional edema [Figure 1].
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