Abstract
Objective The purpose of this article is to review the differential diagnosis of cerebellopontine angle (CPA) masses and their imaging appearances. Conclusion Epidermoids are congenital inclusion cysts, arising from ectodermal inclusion during neural tube closure in the third—fifth week of embryogenesis. Their most common location is the CPA. They commonly present with headache, diplopia, trigeminal neuralgia, and so on. However, rarely they may present as hemifacial spasm. Hence, it is important to think about CPA masses as a possible cause for hemifacial spasm. Different MR sequences help to differentiate epidermoids from other CPA masses.
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