Abstract
Congenital epidermoid of the petrous bone is rare. In a 38-year-old male with progressive right hearing loss and facial nerve palsy, congenital epidermoid of the petrous apex was demonstrated by CT and MRI scans. High-resolution CT showed a soft tissue mass in the right petrous apex with bone destruction and involvement of the internal auditory canal and carotid canal. MRI showed an iso-intensity signal mass in Tl weighted images (TR 1000, TE40) and a highintensity signal mass in T2 weighted images (TR2000, TE80).Comparative evaluations with CT and MRI are useful in evaluating the expansion and characteristics of epidermoids and in differentiating them from other diseases of the petrous bone.
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