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Figure 12: Patient 22. (a) T1 contrast axial and (b) T1 contrast sagittal MR images showing T1, T2 hypointense, nonenhancing lesion in posterior third ventricular region, ambient and quadrigeminal cisterns with mild hydrocephalus. (d) Diffusion weighted images showing restriction of diffusion. (e) Postoperative axial and (f) sagittal images showing total excision. (f) H and E (×400) section showing a cyst lined by thinned out stratified squamous epithelium filled with keratin material suggestive of an epidermoid

Figure 12: Patient 22. (a) T1 contrast axial and (b) T1 contrast sagittal MR images showing T1, T2 hypointense, nonenhancing lesion in posterior third ventricular region, ambient and quadrigeminal cisterns with mild hydrocephalus. (d) Diffusion weighted images showing restriction of diffusion. (e) Postoperative axial and (f) sagittal images showing total excision. (f) H and E (×400) section showing a cyst lined by thinned out stratified squamous epithelium filled with keratin material suggestive of an <i>epidermoid</i>