Fig. 13From: Radiological review of skull lesionsEpidermoid cyst. Axial head CT portrays an expansile lesion in the right frontal bone (thick arrow) with thinning of the inner and outer tables (dashed arrows). Axial T1-weighted imaging (b), axial T2-weighted imaging (c), axial DWI (d) and axial post contrast T1-weighted imaging (e) show that the lesion is hypointense on T1, hyperintense on T2 with restricted diffusion and absent internal enhancement (arrowheads). Note that there may be some enhancement along the peripheral marginsBack to article page