Abstract
A ruptured dermoid cyst is rare and can present with various symptoms. We report imaging findings of an intracranial dermoid cyst that ruptured into the endolymphatic sac, causing sudden sensorineural hearing loss.
Highlights
Dermoid cyst is a rare congenital intracranial tumor.[1]. It arises from ectopic inclusion of the embryonic ectoderm into the neural tube during the third to fifth weeks of embryonic life and is usually located in the midline.[2]
Dermoid cysts are composed of a stratified squamous epithelium and skin adnexal structures, such as hair follicles, sebaceous, or sweat glands; they contain products of these adnexal structures and epithelium, such as lipid metabolites, cholesterol crystals, hair, decomposed epithelial cells, and calcification.[2,3]
Symptoms related to unruptured dermoid cysts are nonspecific.[1,3,5,6]
Summary
The final diagnosis of a dermoid cyst that had ruptured into the endolymphatic sac was made on the basis of surgical and histopathologic findings and radiologic evidence of lipids in the endolymphatic structure.
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