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Figure 1: CT and MRI scans of the epidermoid cyst within the CSP. (a) Axial view of plain CT scan shows a hypodense cystic lesion with marginal calcification (arrowheads) located within the CSP. The lesion is hypointense signal on T1 (b), hyperintense signal on T2 (c), and heterogeneous signal on FLAIR sequences (d). Coronal (e) and sagittal (f) T1-weighted gadolinium-enhanced MRI shows a nonenhancing lesion with superior displacement of ACAs (solid arrows) and inferior displacement of the internal cerebral veins (outline arrows).

Figure 1: CT and MRI scans of the epidermoid cyst within the CSP. (a) Axial view of plain CT scan shows a hypodense cystic lesion with marginal calcification (arrowheads) located within the CSP. The lesion is hypointense signal on T1 (b), hyperintense signal on T2 (c), and heterogeneous signal on FLAIR sequences (d). Coronal (e) and sagittal (f) T1-weighted gadolinium-enhanced MRI shows a nonenhancing lesion with superior displacement of ACAs (solid arrows) and inferior displacement of the internal cerebral veins (outline arrows).