PMC6417289_01
(a-c) Axial T1, T2, postcontrast magnetic resonance imaging showing an intra-axial lesion seen in the left basifrontal region measuring 4.2 cm x 5.2 cm x 5 cm (CC x AP x Trans) isointense on T1, homogeneously hypointense on T2 (large arrow) with peripheral nodular hyperintensity (small arrow) on T1, T2 images. There is mild rim enhancement of the lesion with heterogeneous enhancement of peripheral nodule. (d) No increased cerebral blood volume noted within the lesion on perfusion image. (e and f) Diffusion and ADC (Apparent diffusion co-efficient) images showing no restricted diffusion. (g) Axial noncontrast computed tomography revealing homogeneously hyperdense lesion (large arrow) with eccentric nodule having calcification (small arrow). (h) Paraffin section showing keratinized stratified squamous epithelium and pilosebaceous gland (curved and straight arrows) (H and E, x100)
AJNS-14-269-g001.jpg
PMC6417289_01_AJNS-14-269-g001.jpg
F1
MRI [Figure 1a-f] showed an intra-axial lesion in the left basifrontal region measuring 4.2 cm x 5.2 cm x 5 cm (CC x AP x Noncontrast CT [Figure 1g] showed a homogeneously hyperdense lesion with an eccentric nodule having calcification (arrow). Histopathological examination [Figure 1h] showed keratinized stratified squamous epithelium with pilosebaceous cysts (arrows) suggestive of a dermoid cyst.
PMC6417289_02
(a-c) Axial T1, T2, and postcontrast T1 magnetic resonance imaging showing a nonenhancing intra-axial lesion in the left cerebellar hemisphere measuring 50 cm x 57 cm x 46 mm (AP x ML x CC). The lesion is hypointense on T1 and significantly hypointense on T2 with peripheral mural nodule which shows heterogeneous signal. (d and e) Diffusion and ADC images showing no restricted diffusion. (f) Axial noncontrast computed tomography images showing homogeneously hyperdense lesion (large arrow) with peripheral nodule with areas of calcification (small arrow) and mild fat density (curved arrow). (g) Paraffin section showing keratinized stratified squamous epithelium with proliferating sebaceous gland (arrow) (H and E, x100)
AJNS-14-269-g002.jpg
PMC6417289_02_AJNS-14-269-g002.jpg
F2
Noncontrast CT scan images [Figure 2f] showed homogeneously hyperdense lesion (large arrow) with a peripheral mural nodule containing calcification (small arrow) and mild fat density (curved black arrow).