Epidermoid Tumors:

These tumors represent approximately 5% of lesions in the CPA (cerebellopontine angle), which is the most common location for epidermoid tumors. They are congenital, non neo-plastic slow growing lesions that likely develop from epithelial remnants during neural tube development.

Epidermoid tumors enlarge by desquamation (shedding) of cells into a cystic cavity and surround neural and vascular structures rather than displace them. Rarely is there a malignant transformation. Epidermoid tumors usually present when a person is in their 40’s with symptoms compatible with their specific location in the brain.

CT and MRI scans are helpful in evaluation and treatment is specific to the patient’s age, symptoms, etc. There is no medical treatment and surgical excision must be weighed against risk of neurovascular deficit.