PMC8422425_01
Axial (a), coronal (b), and sagittal (c) T1 gadolinium-enhanced brain MRI of arachnoid cyst (7 x 8 x 7 cm).
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F1
Magnetic resonance imaging (MRI) scans showed giant arachnoid cyst of the right hemisphere [Figure 1].
Monopolar (a) and bipolar (b) EEG showing epileptiform activity. T2-FLAIR MRI (c) revealed signs of local swallowing of brain tissue. CT cisternography (d) shows no signs of contrast in the cyst's cavity despite filling of lateral ventricles with contrast.
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F2
EEG detected epileptiform activity from the right frontal lobe [Figures 2a and b]. Computed tomography (CT) cisternography confirmed that cyst was isolated from subarachnoid space [Figures 2c and d].
Patients positioning (a), intraoperative findings (b and c).
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F3
Histological findings (a and b) and postoperative monopolar (c) and bipolar (d) EEG.
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F4
Postoperative course was fine, headaches disappeared, EEG showed resolution of epileptiform activity [Figure 4c and d].
PMC8422425_02
Histological findings (a and b) and postoperative monopolar (c) and bipolar (d) EEG.
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F4
Postoperative course was fine, headaches disappeared, EEG showed resolution of epileptiform activity [Figure 4c and d].